{"segment":[{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["7"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 b\u00fat trong $12$ h\u1ed9p b\u00fat \u1edf c\u1eeda h\u00e0ng t\u1ea1p h\u00f3a trong b\u1ea3ng sau: <br\/> <table><tr><th>6<\/th><th>7<\/th><th>11<\/th><th>11<\/th><th>6<\/th><th>5<\/th><\/tr><tr><td>6<\/td><td>7<\/td><td>8<\/td><td>12<\/td><td>10<\/td><td>7<\/td><\/tr><\/table> <br\/> S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 _input_ <\/span>","explain":"<span class='basic_left'>T\u1eeb b\u1ea3ng s\u1ed1 li\u1ec7u \u0111\u00e3 cho c\u1ee7a b\u00e0i to\u00e1n, ta th\u1ea5y c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0: $5;6;7;8;10;11;12$ <br\/> Do \u0111\u00f3, s\u1ed1 gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 $7$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $7$.<\/span><\/span>"}]}],"id_ques":991},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["16"],["11"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 c\u00f4ng nh\u00e2n c\u1ee7a $18$ ph\u00e2n x\u01b0\u1edfng trong m\u1ed9t nh\u00e0 m\u00e1y v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>13<\/th><th>15<\/th><th>12<\/th><th>12<\/th><th>14<\/th><th>13<\/th><th>11<\/th><th>12<\/th><th>11<\/th><\/tr><tr><td>11<\/td><td>14<\/td><td>11<\/td><td>14<\/td><td>14<\/td><td>11<\/td><td>13<\/td><td>16<\/td><td>11<\/td><\/tr><\/table> <br\/> Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 _input_ <br\/> Gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t l\u00e0 _input_ <\/span>","explain":"<span class='basic_left'> T\u1eeb b\u1ea3ng s\u1ed1 li\u1ec7u \u0111\u00e3 cho trong \u0111\u1ec1 b\u00e0i, ta th\u1ea5y c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0: $11;12;13;14;15;16$ <br\/> Do \u0111\u00f3, gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 $16$, gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t l\u00e0 $11.$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 $16; 11.$<\/span><\/span>"}]}],"id_ques":992},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <span class='basic_left'>Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat c\u1ee7a $16$ h\u1ecdc sinh trong m\u1ed9t l\u1edbp v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>6<\/th><th>6<\/th><th>11<\/th><th>9<\/th><th>5<\/th><th>5<\/th><th>12<\/th><th>12<\/th><\/tr><tr><td>8<\/td><td>6<\/td><td>6<\/td><td>7<\/td><td>6<\/td><td>9<\/td><td>12<\/td><td>12<\/td><\/tr><\/table> <br\/> <b>C\u00e2u 1.<\/b> D\u1ea5u hi\u1ec7u th\u1ed1ng k\u00ea l\u00e0: <\/span>","select":["A. $16$ h\u1ecdc sinh","B. Th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat c\u1ee7a m\u1ed7i h\u1ecdc sinh","C. L\u1edbp c\u00f3 $16$ h\u1ecdc sinh","D. Th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat c\u1ee7a l\u1edbp"],"explain":"<span class='basic_left'>D\u1ea5u hi\u1ec7u th\u1ed1ng k\u00ea l\u00e0: Th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat c\u1ee7a m\u1ed7i h\u1ecdc sinh.<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":1}]}],"id_ques":993},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'>Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat c\u1ee7a $16$ h\u1ecdc sinh trong m\u1ed9t l\u1edbp v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>6<\/th><th>6<\/th><th>11<\/th><th>9<\/th><th>5<\/th><th>5<\/th><th>12<\/th><th>12<\/th><\/tr><tr><td>8<\/td><td>6<\/td><td>6<\/td><td>7<\/td><td>6<\/td><td>9<\/td><td>12<\/td><td>12<\/td><\/tr><\/table> <br\/> <b>C\u00e2u 2.<\/b> T\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0: <\/span>","select":["A. $12$","B. $11$","C. $6$","D. $5$"],"explain":"<span class='basic_left'>C\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0: $5;6;7;8;9;11;12$ <br\/> T\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb tr\u00ean l\u00e0: $2;5;1;1;2;1;4$ <br\/> Do \u0111\u00f3, t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $5.$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":4}]}],"id_ques":994},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'><center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai23/lv1/img\/D7B23D1_4.png' \/><\/center> Cho bi\u1ec3u \u0111\u1ed3 tr\u00ean v\u1edbi tr\u1ee5c ho\u00e0nh l\u00e0 ''gi\u00e1 tr\u1ecb $(x)$'' v\u00e0 tr\u1ee5c tung l\u00e0 ''t\u1ea7n s\u1ed1 $(n)$'' <br\/> <b>C\u00e2u 1.<\/b> S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <\/span>","select":["A. $26$","B. $27$","C. $28$","D. $30$"],"hint":"S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u $(N)$ b\u1eb1ng t\u1ed5ng t\u1ea7n s\u1ed1 c\u1ee7a c\u00e1c gi\u00e1 tr\u1ecb.","explain":"<span class='basic_left'>D\u1ef1a v\u00e0o bi\u1ec3u \u0111\u1ed3 \u0111\u00e3 cho, ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d t\u01b0\u01a1ng \u1ee9ng sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>11<\/th><th>12<\/th><th>14<\/th><th>15<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>8<\/td><td>6<\/td><td>9<\/td><td>3<\/td><td>$N=?$<\/td><\/tr><\/table> <br\/> S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $N=8+6+9+3=26$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":4}]}],"id_ques":995},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"fill_the_blank","correct":[[["14"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai23/lv1/img\/D7B23D1_4.png' \/><\/center>Cho bi\u1ec3u \u0111\u1ed3 tr\u00ean v\u1edbi tr\u1ee5c ho\u00e0nh l\u00e0 ''gi\u00e1 tr\u1ecb $(x)$'' v\u00e0 tr\u1ee5c tung l\u00e0 ''t\u1ea7n s\u1ed1 $(n)$'' <br\/> <b>C\u00e2u 2.<\/b> M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 _input_ <\/span>","hint":"M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 gi\u00e1 tr\u1ecb c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t.","explain":"<span class='basic_left'> Theo c\u00e2u 1, ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>11<\/th><th>12<\/th><th>14<\/th><th>15<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>8<\/td><td>6<\/td><td>9<\/td><td>3<\/td><td>$N=26$<\/td><\/tr><\/table> <br\/> Theo b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d ta th\u1ea5y gi\u00e1 tr\u1ecb $14$ c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $9.$ <br\/> Do \u0111\u00f3, m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $14. $ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $14$.<\/span><\/span>"}]}],"id_ques":996},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'>Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 chim b\u1ed3 c\u00e2u c\u1ee7a $18$ chu\u1ed3ng trong m\u1ed9t trang tr\u1ea1i ch\u0103n nu\u00f4i v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>11<\/th><th>7<\/th><th>6<\/th><th>11<\/th><th>8<\/th><th>7<\/th><th>9<\/th><th>11<\/th><th>9<\/th><\/tr><tr><td>8<\/td><td>10<\/td><td>9<\/td><td>9<\/td><td>10<\/td><td>10<\/td><td>6<\/td><td>11<\/td><td>10<\/td><\/tr><\/table> <br\/> D\u1ea5u hi\u1ec7u th\u1ed1ng k\u00ea l\u00e0: <\/span>","select":["A. S\u1ed1 chim b\u1ed3 c\u00e2u c\u1ee7a trang tr\u1ea1i ch\u0103n nu\u00f4i","B. Trang tr\u1ea1i ch\u0103n nu\u00f4i c\u00f3 $18$ chu\u1ed3ng","C. $18$ chu\u1ed3ng","D. S\u1ed1 chim b\u1ed3 c\u00e2u c\u1ee7a m\u1ed7i chu\u1ed3ng"],"hint":"D\u1ea5u hi\u1ec7u l\u00e0 v\u1ea5n \u0111\u1ec1 hay hi\u1ec7n t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c \u0111i\u1ec1u tra.","explain":"<span class='basic_left'>D\u1ea5u hi\u1ec7u th\u1ed1ng k\u00ea l\u00e0: S\u1ed1 chim b\u1ed3 c\u00e2u c\u1ee7a m\u1ed7i chu\u1ed3ng. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":1}]}],"id_ques":997},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["16"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 h\u1ecdc sinh c\u1ee7a c\u00e1c l\u1edbp h\u1ecdc trong m\u1ed9t tr\u01b0\u1eddng trung h\u1ecdc c\u01a1 s\u1edf v\u00e0 ghi l\u1ea1i trong b\u1ea3ng ''t\u1ea7n s\u1ed1'' sau: <br\/> <table><tr><th>S\u1ed1 h\u1ecdc sinh $(x)$<\/th><th>30<\/th><th>31<\/th><th>33<\/th><th>34<\/th><th>35<\/th><th>36<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>1<\/td><td>1<\/td><td>2<\/td><td>5<\/td><td>4<\/td><td>3<\/td><td>$N$<\/td><\/tr><\/table> <br\/> S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 _input_ <\/span>","hint":"S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb $(N)$ c\u1ee7a d\u1ea5u hi\u1ec7u b\u1eb1ng t\u1ed5ng t\u1ea7n s\u1ed1 c\u1ee7a c\u00e1c d\u1ea5u hi\u1ec7u.","explain":"<span class='basic_left'> S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $N=1+1+2+5+4+3=16$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $16$.<\/span><\/span>"}]}],"id_ques":998},{"time":5,"part":[{"title":"Ch\u1ecdn <u>nh\u1eefng<\/u> \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"Ch\u1ecdn \u0111\u01b0\u1ee3c nhi\u1ec1u \u0111\u00e1p \u00e1n","temp":"checkbox","correct":[["1","2"]],"list":[{"point":10,"img":"","ques":"<span class='basic_left'>Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea tu\u1ed5i ngh\u1ec1 t\u00ednh theo n\u0103m c\u1ee7a $14$ c\u00f4ng nh\u00e2n trong m\u1ed9t nh\u00e0 m\u00e1y v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>12<\/th><th>7<\/th><th>8<\/th><th>12<\/th><th>6<\/th><th>11<\/th><th>11<\/th><\/tr><tr><td>10<\/td><td>8<\/td><td>8<\/td><td>11<\/td><td>7<\/td><td>9<\/td><td>10<\/td><\/tr><\/table> <\/span>","hint":"","column":1,"number_true":2,"select":["A. D\u1ea5u hi\u1ec7u th\u1ed1ng k\u00ea l\u00e0 tu\u1ed5i ngh\u1ec1 c\u1ee7a m\u1ed7i c\u00f4ng nh\u00e2n trong nh\u00e0 m\u00e1y","B. S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $14$","C. S\u1ed1 gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 $6$","D. Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 $11$"],"explain":"<span class='basic_left'>T\u1eeb b\u1ea3ng s\u1ed1 li\u1ec7u \u0111\u00e3 cho ta th\u1ea5y: <br\/> - D\u1ea5u hi\u1ec7u th\u1ed1ng k\u00ea l\u00e0 tu\u1ed5i ngh\u1ec1 c\u1ee7a m\u1ed7i c\u00f4ng nh\u00e2n trong nh\u00e0 m\u00e1y <br\/> $\\Rightarrow$ A \u0111\u00fang. <br\/> - S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $14$ <br\/> $\\Rightarrow$ B \u0111\u00fang. <br\/> - C\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0: $6;7;8;9;10;11;12.$Do \u0111\u00f3 s\u1ed1 gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 $7$ <br\/> $\\Rightarrow$ C sai. <br\/> - Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 $12$ <br\/> $\\Rightarrow $ D sai. <br\/> <span class='basic_pink'>Do \u0111\u00f3 c\u00f3 hai kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 A v\u00e0 B.<\/span> <\/span>"}]}],"id_ques":999},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2007"],["2010"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai23/lv1/img\/D7B23D1_8.png' \/><\/center> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa c\u1ee7a m\u1ed9t \u0111\u1ecba ph\u01b0\u01a1ng trong c\u00e1c n\u0103m t\u00ednh theo h\u00e9c-ta r\u1ed3i bi\u1ec3u di\u1ec5n th\u00e0nh bi\u1ec3u \u0111\u1ed3 \u1edf tr\u00ean. <br\/> \u0110i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng trong c\u00e1c c\u00e2u sau: <br\/> - Di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa \u0111\u1ea1t \u00edt nh\u1ea5t v\u00e0o n\u0103m _input_ <br\/> - Di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa \u0111\u1ea1t nhi\u1ec1u nh\u1ea5t v\u00e0o n\u0103m _input_ <\/span>","explain":"<span class='basic_left'> Theo bi\u1ec3u \u0111\u1ed3 \u1edf tr\u00ean ta c\u00f3: <br\/> - Di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa \u0111\u1ea1t \u00edt nh\u1ea5t v\u00e0o n\u0103m $2007$ l\u00e0 $111$ h\u00e9c \u2013 ta <br\/> - Di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa \u0111\u1ea1t nhi\u1ec1u nh\u1ea5t v\u00e0o n\u0103m $2010$ l\u00e0 $145$ h\u00e9c \u2013 ta <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 $2007$ v\u00e0 $2010.$<\/span><\/span>"}]}],"id_ques":1000},{"time":5,"part":[{"title":"Ch\u1ecdn <u>nh\u1eefng<\/u> \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"Ch\u1ecdn \u0111\u01b0\u1ee3c nhi\u1ec1u \u0111\u00e1p \u00e1n","temp":"checkbox","correct":[["1","4"]],"list":[{"point":10,"img":"","ques":"<span class='basic_left'>Ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d sau: <br\/> <table><tr><th>S\u1ed1 b\u00fat (x)<\/th><th>5<\/th><th>6<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th>11<\/th><th>12<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 (n)<\/td><td>1<\/td><td>1<\/td><td>2<\/td><td>1<\/td><td>2<\/td><td>4<\/td><td>6<\/td><td>1<\/td><td>N=18<\/td><\/tr><\/table> <\/span>","hint":"","column":2,"number_true":2,"select":["A. T\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $6$","B. M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $12$","C. S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 $18$","D. Gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t l\u00e0 $5$"],"explain":"<span class='basic_left'>T\u1eeb b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d ta c\u00f3: <br\/> - T\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $6$ $\\Rightarrow$ A \u0111\u00fang. <br\/> - Gi\u00e1 tr\u1ecb $11$ c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t n\u00ean m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $11$ $\\Rightarrow$ B sai. <br\/> - S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 $8$ $\\Rightarrow$ C sai. <br\/>- Gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t l\u00e0 $5$ $\\Rightarrow$ D \u0111\u00fang. <br\/> <span class='basic_pink'> Do \u0111\u00f3 c\u00f3 hai kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang l\u00e0 A v\u00e0 D. <\/span> <\/span>"}]}],"id_ques":1001},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho ba c\u00e2u","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'> Trong n\u0103m $2016$ m\u1ed9t ph\u00e2n x\u01b0\u1edfng s\u1ea3n xu\u1ea5t qu\u1ea1t m\u00e1y s\u1ea3n l\u01b0\u1ee3ng h\u00e0ng th\u00e1ng \u0111\u01b0\u1ee3c th\u1ed1ng k\u00ea nh\u01b0 sau: <br\/> <table><tr><th>51<\/th><th>50<\/th><th>54<\/th><th>50<\/th><\/tr><tr><td>43<\/td><td>47<\/td><td>50<\/td><td>51<\/td><\/tr><tr><td>51<\/td><td>53<\/td><td>49<\/td><td>43<\/td><\/tr><\/table> <br\/> <b> C\u00e2u 1. <\/b> S\u1ed1 gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0: ","select":["A. $4$","B. $5$","C. $6$","D. $7$"],"explain":"<span class='basic_left'>C\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0: $43;47;49;50;51;53;54$ <br\/> Do \u0111\u00f3, s\u1ed1 gi\u00e1 tr\u1ecb kh\u00e1c nhau l\u00e0 $7$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":4}]}],"id_ques":1002},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho ba c\u00e2u","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <span class='basic_left'> Trong n\u0103m $2016$ m\u1ed9t ph\u00e2n x\u01b0\u1edfng s\u1ea3n xu\u1ea5t qu\u1ea1t m\u00e1y s\u1ea3n l\u01b0\u1ee3ng h\u00e0ng th\u00e1ng \u0111\u01b0\u1ee3c th\u1ed1ng k\u00ea nh\u01b0 sau: <br\/> <table><tr><th>51<\/th><th>50<\/th><th>54<\/th><th>50<\/th><\/tr><tr><td>43<\/td><td>47<\/td><td>50<\/td><td>51<\/td><\/tr><tr><td>51<\/td><td>53<\/td><td>49<\/td><td>43<\/td><\/tr><\/table> <br\/> <b> C\u00e2u 2. <\/b> L\u1eadp b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d v\u00e0 t\u00ednh s\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u. <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: ","select":["A. $48$","B. $48,5$","C. $49,33$","D. $50,46$"],"explain":"<span class='basic_left'>Ta c\u00f3 b\u1ea3ng sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>T\u1ea7n s\u1ed1 $(n)$<\/th><th>C\u00e1c t\u00edch $(x.n)$<\/th><\/tr><tr><td>43<\/td><td>2<\/td><td>86<\/td><\/tr><tr><td>47<\/td><td>1<\/td><td>47<\/td><\/tr><tr><td>49<\/td><td>1<\/td><td>49<\/td><\/tr><tr><td>50<\/td><td>3<\/td><td>150<\/td><\/tr><tr><td>51<\/td><td>3<\/td><td>153<\/td><\/tr><tr><td>53<\/td><td>1<\/td><td>53<\/td><\/tr><tr><td>54<\/td><td>1<\/td><td>54<\/td><\/tr><tr><td><\/td><td>$N=12$<\/td><td>T\u1ed5ng: $592$<\/td><\/tr><\/table> <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{592}{12}=49,33$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":4}]}],"id_ques":1003},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho ba c\u00e2u","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <span class='basic_left'> Trong n\u0103m $2016$ m\u1ed9t ph\u00e2n x\u01b0\u1edfng s\u1ea3n xu\u1ea5t qu\u1ea1t m\u00e1y s\u1ea3n l\u01b0\u1ee3ng h\u00e0ng th\u00e1ng \u0111\u01b0\u1ee3c th\u1ed1ng k\u00ea nh\u01b0 sau: <br\/> <table><tr><th>51<\/th><th>50<\/th><th>54<\/th><th>50<\/th><\/tr><tr><td>43<\/td><td>47<\/td><td>50<\/td><td>51<\/td><\/tr><tr><td>51<\/td><td>53<\/td><td>49<\/td><td>43<\/td><\/tr><\/table> <br\/> <b> C\u00e2u 3. <\/b> M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: ","select":["A. $3$","B. $50$ v\u00e0 $51$","C. $54$","D. $51$"],"explain":"<span class='basic_left'>Ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d t\u01b0\u01a1ng \u1ee9ng nh\u01b0 sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>T\u1ea7n s\u1ed1 $(n)$<\/th><\/tr><tr><td>43<\/td><td>2<\/td><\/tr><tr><td>47<\/td><td>1<\/td><\/tr><tr><td>49<\/td><td>1<\/td><\/tr><tr><td>50<\/td><td>3<\/td><\/tr><tr><td>51<\/td><td>3<\/td><\/tr><tr><td>53<\/td><td>1<\/td><\/tr><tr><td>54<\/td><td>1<\/td><\/tr><tr><td><\/td><td>$N=12$<\/td><\/tr><\/table> <br\/> Ta th\u1ea5y hai gi\u00e1 tr\u1ecb $50$ v\u00e0 $51$ \u0111\u1ec1u c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $3$ <br\/> Do \u0111\u00f3, m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $50$ v\u00e0 $51.$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":4}]}],"id_ques":1004},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["21"],["18"],["11"],["9"],["63"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> \u0110i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng trong b\u1ea3ng d\u01b0\u1edbi d\u00e2y: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>T\u1ea7n s\u1ed1 $(n)$<\/th><th>C\u00e1c t\u00edch $(x.n)$<\/th><\/tr><tr><td>3<\/td><td>1<\/td><td>3<\/td><\/tr><tr><td>5<\/td><td>2<\/td><td>10<\/td><\/tr><tr><td>7<\/td><td>3<\/td><td>_input_<\/td><\/tr><tr><td>9<\/td><td>2<\/td><td>_input_<\/td><\/tr><tr><td>11<\/td><td>1<\/td><td>_input_<\/td><\/tr><tr><td><\/td><td>$N=$ _input_<\/td><td>T\u1ed5ng: _input_<\/td><\/tr><\/table> <\/span>","explain":"<span class='basic_left'>Ta c\u00f3 b\u1ea3ng \u0111\u1ea7y \u0111\u1ee7 nh\u01b0 sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>T\u1ea7n s\u1ed1 $(n)$<\/th><th>C\u00e1c t\u00edch $(x.n)$<\/th><\/tr><tr><td>3<\/td><td>1<\/td><td>3<\/td><\/tr><tr><td>5<\/td><td>2<\/td><td>10<\/td><\/tr><tr><td>7<\/td><td>3<\/td><td>21<\/td><\/tr><tr><td>9<\/td><td>2<\/td><td>18<\/td><\/tr><tr><td>11<\/td><td>1<\/td><td>11<\/td><\/tr><tr><td><\/td><td>$N=9$<\/td><td>T\u1ed5ng: $63$<\/td><\/tr><\/table> <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: $21;18;11;9;63$<\/span><\/span>"}]}],"id_ques":1005},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["11,2"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Cho b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d nh\u01b0 sau: <br\/><table><tr><th>S\u1ed1 c\u00f4ng nh\u00e2n $(x)$<\/th><th>10<\/th><th>11<\/th><th>12<\/th><th>13<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>7<\/td><td>9<\/td><td>6<\/td><td>3<\/td><td>$N=25$<\/td><\/tr><\/table> <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 _input_ <br\/> (l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 nh\u1ea5t) <\/span>","explain":"<span class='basic_left'>S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{10.7+11.9+12.6+13.3}{7+9+6+3}=\\dfrac{280}{25}=11,2$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $11,2$.<\/span><\/span>"}]}],"id_ques":1006},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <span class='basic_left'> Cho bi\u1ec3u \u0111\u1ed3 sau v\u1edbi tr\u1ee5c ho\u00e0nh l\u00e0 <b> gi\u00e1 tr\u1ecb $(x)$ <\/b> , tr\u1ee5c tung l\u00e0 <b>t\u1ea7n s\u1ed1 $(n)$ <\/b>. <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai23/lv1/img\/D7B23D1_13.png' \/><\/center> L\u1eadp b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d v\u00e0 t\u00ednh s\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u. <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: ","select":["A. $5$","B. $\\approx 6,32$","C. $\\approx 7,45$","D. $8$"],"explain":"<span class='basic_left'>T\u1eeb bi\u1ec3u \u0111\u1ed3, ta c\u00f3 b\u1ea3ng sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>T\u1ea7n s\u1ed1 $(n)$<\/th><th>C\u00e1c t\u00edch $(x.n)$<\/th><\/tr><tr><td>3<\/td><td>3<\/td><td>9<\/td><\/tr><tr><td>4<\/td><td>4<\/td><td>16<\/td><\/tr><tr><td>6<\/td><td>2<\/td><td>12<\/td><\/tr><tr><td>8<\/td><td>9<\/td><td>72<\/td><\/tr><tr><td>9<\/td><td>8<\/td><td>72<\/td><\/tr><tr><td>10<\/td><td>5<\/td><td>50<\/td><\/tr><tr><td><\/td><td>$N=31$<\/td><td>T\u1ed5ng: $231$<\/td><\/tr><\/table> <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{231}{31}\\approx 7,45$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":4}]}],"id_ques":1007},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <span class='basic_left'> M\u1ed9t c\u1eeda h\u00e0ng b\u00e1n d\u00e9p ghi l\u1ea1i s\u1ed1 d\u00e9p \u0111\u00e3 b\u00e1n cho n\u1eef gi\u1edbi trong m\u1ed9t qu\u00fd theo c\u00e1c c\u1ee1 kh\u00e1c nhau nh\u01b0 sau: <br\/> <table><tr><th>C\u1ee1 d\u00e9p $(x)$<\/th><th>34<\/th><th>35<\/th><th>36<\/th><th>37<\/th><th>38<\/th><th>39<\/th><th>40<\/th><th><\/th><\/tr><tr><td>S\u1ed1 \u0111\u00f4i d\u00e9p b\u00e1n \u0111\u01b0\u1ee3c $(n)$<\/td><td>62<\/td><td>80<\/td><td>124<\/td><td>43<\/td><td>21<\/td><td>13<\/td><td>1<\/td><td>$N=344$<\/td><\/tr><\/table> <br\/> <b>C\u00e2u 1.<\/b> S\u1ed1 n\u00e0o c\u00f3 th\u1ec3 \u201c\u0111\u1ea1i di\u1ec7n\u201d cho d\u1ea5u hi\u1ec7u? <\/span> ","select":["A. $35$","B. $36$","C. $37$","D. $40$"],"explain":"<span class='basic_left'>M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u $M_o=36$ l\u00e0 \u0111\u1ea1i di\u1ec7n cho d\u1ea5u hi\u1ec7u v\u00ec \u0111\u00f3 l\u00e0 \u0111i\u1ec1u c\u1eeda h\u00e0ng quan t\u00e2m: c\u1ee1 d\u00e9p n\u00e0o b\u00e1n \u0111\u01b0\u1ee3c nhi\u1ec1u nh\u1ea5t. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span> <br\/> <b>L\u01b0u \u00fd:<\/b> Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u \u0111\u01b0\u1ee3c coi l\u00e0 \u201c\u0111\u1ea1i \u0111i\u1ec7n\u201d c\u1ee7a d\u1ea5u hi\u1ec7u ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1 trung b\u00ecnh c\u1ed9ng (n\u1ebfu nh\u01b0 m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u th\u1ec3 hi\u1ec7n \u0111i\u1ec1u m\u00e0 \u0111\u1ec1 b\u00e0i quan t\u00e2m) <\/span>","column":4}]}],"id_ques":1008},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'> M\u1ed9t c\u1eeda h\u00e0ng b\u00e1n d\u00e9p ghi l\u1ea1i s\u1ed1 d\u00e9p \u0111\u00e3 b\u00e1n cho n\u1eef gi\u1edbi trong m\u1ed9t qu\u00fd theo c\u00e1c c\u1ee1 kh\u00e1c nhau nh\u01b0 sau: <br\/> <table><tr><th>C\u1ee1 d\u00e9p $(x)$<\/th><th>34<\/th><th>35<\/th><th>36<\/th><th>37<\/th><th>38<\/th><th>39<\/th><th>40<\/th><th><\/th><\/tr><tr><td>S\u1ed1 \u0111\u00f4i d\u00e9p b\u00e1n \u0111\u01b0\u1ee3c $(n)$<\/td><td>62<\/td><td>80<\/td><td>124<\/td><td>43<\/td><td>21<\/td><td>13<\/td><td>1<\/td><td>$N=344$<\/td><\/tr><\/table> <br\/> <b>C\u00e2u 2.<\/b> Nh\u1eadn x\u00e9t sau \u0111\u00e2y \u0110\u00fang hay Sai? <br\/> C\u1ee1 d\u00e9p ph\u00f9 h\u1ee3p v\u1edbi ph\u1ee5 n\u1eef l\u00e0 t\u1eeb $34$ \u0111\u1ebfn $37,$ trong \u0111\u00f3 c\u1ee1 d\u00e9p $36$ l\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u ph\u1ee5 n\u1eef nh\u1ea5t. <\/span> ","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'>Theo b\u1ea3ng s\u1ed1 li\u1ec7u \u0111\u00e3 cho ta th\u1ea5y c\u00e1c c\u1ee1 d\u00e9p t\u1eeb $34$ \u0111\u1ebfn $37$ b\u00e1n \u0111\u01b0\u1ee3c s\u1ed1 l\u01b0\u1ee3ng nhi\u1ec1u h\u01a1n so v\u1edbi c\u00e1c c\u1ee1 d\u00e9p c\u00f2n l\u1ea1i. Trong \u0111\u00f3 c\u1ee1 d\u00e9p $36$ b\u00e1n \u0111\u01b0\u1ee3c nhi\u1ec1u nh\u1ea5t. <br\/> $\\Rightarrow$ C\u1ee1 d\u00e9p ph\u00f9 h\u1ee3p v\u1edbi ph\u1ee5 n\u1eef l\u00e0 t\u1eeb $34$ \u0111\u1ebfn $37,$ trong \u0111\u00f3 c\u1ee1 d\u00e9p $36$ l\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u ph\u1ee5 n\u1eef nh\u1ea5t. <br\/> Do \u0111\u00f3, nh\u1eadn x\u00e9t tr\u00ean l\u00e0 \u0110\u00fang <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 \u0110\u00fang.<\/span> <\/span>","column":2}]}],"id_ques":1009},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'> Cho b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>3<\/th><th>5<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>4<\/td><td>x<\/td><td>3<\/td><td>2<\/td><td>5<\/td><td>$N=20$<\/td><\/tr><\/table> <br\/> Gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u00e0: <\/span> ","select":["A. $3$","B. $4$","C. $5$","D. $6$"],"hint":"S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb $(N)$ b\u1eb1ng t\u1ed5ng t\u1ea7n s\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb.","explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $\\begin{align} & 4+x+3+2+5=20 \\\\ & \\Rightarrow 14+x=20 \\\\ & \\Rightarrow x=20-14 \\\\ & \\Rightarrow x=6 \\\\ \\end{align}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span> <\/span>","column":4}]}],"id_ques":1010}],"lesson":{"save":0,"level":1}}