Lũy thừa với số mũ tự nhiên. Nhân hai lũy thừa cùng cơ số

Home Lớp 6 Toán lớp 6 - Sách kết nối tri thức Lũy thừa với số mũ tự nhiên. Nhân hai lũy thừa cùng cơ sốBài tập trung bình

{"common":{"save":0,"post_id":"719","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"271","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Vi\u1ebft 121 th\u00e0nh b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean: <br\/> 121 = ?","select":["A. $11^{2}$ ","B. $2^{11}$ ","C. $8^{2}$ "],"hint":"vi\u1ebft 121 d\u01b0\u1edbi d\u1ea1ng $a^2$, a l\u00e0 s\u1ed1 t\u1ef1 nhi\u00ean","explain":"H\u01b0\u1edbng d\u1eabn: <br\/> <\/span> C\u00e1ch 1: <\/b>Vi\u1ebft 121 d\u01b0\u1edbi d\u1ea1ng b\u00ecnh ph\u01b0\u01a1ng 1 s\u1ed1 t\u1ef1 nhi\u00ean hay ch\u00ednh l\u00e0 vi\u1ebft 121 d\u01b0\u1edbi d\u1ea1ng $a^2$ <br\/> C\u00e1ch 2: <\/b> T\u00ednh k\u1ebft qu\u1ea3 t\u1eebng l\u0169y th\u1eeba trong \u0111\u00e1p \u00e1n xem \u0111\u00e1p \u00e1n n\u00e0o c\u00f3 k\u1ebft qu\u1ea3 b\u1eb1ng 121<br\/><\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: 121 = 11 . 11 = $11^2$<br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. $11^2$<\/span> <br\/>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"272","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Vi\u1ebft 225 th\u00e0nh b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean: <br\/> 225 = ?","select":["A. $5^{4}$ ","B. $15^{2}$ ","C. $13^{2}$ "],"hint":"vi\u1ebft 225 d\u01b0\u1edbi d\u1ea1ng $a^2$, a l\u00e0 s\u1ed1 t\u1ef1 nhi\u00ean","explain":"H\u01b0\u1edbng d\u1eabn: <br\/> <\/span> C\u00e1ch 1: <\/b>Vi\u1ebft 225 d\u01b0\u1edbi d\u1ea1ng b\u00ecnh ph\u01b0\u01a1ng 1 s\u1ed1 t\u1ef1 nhi\u00ean hay ch\u00ednh l\u00e0 vi\u1ebft 225 d\u01b0\u1edbi d\u1ea1ng $a^2$ <br\/> C\u00e1ch 2: <\/b> T\u00ednh k\u1ebft qu\u1ea3 t\u1eebng l\u0169y th\u1eeba trong \u0111\u00e1p \u00e1n xem \u0111\u00e1p \u00e1n n\u00e0o c\u00f3 k\u1ebft qu\u1ea3 b\u1eb1ng 225<br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: 225 = 5 . 5 . 3 . 3 = (5 . 3). (5 . 3) = 15 . 15 = $15^2$<br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $15^2$<\/span> <br\/>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"273","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"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":"<center><img src='img\/4.jpg' \/><\/center> <br\/> Vi\u1ebft g\u1ecdn t\u00edch sau d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u1ee7a m\u1ed9t s\u1ed1: <br\/> 4 . 8 . 8 . 2 = ? ","select":["A. $2^8$","B. $2^4$","C. $2^9$"],"hint":"\u0110\u01b0a t\u00edch tr\u00ean v\u1ec1 l\u0169y th\u1eeba c\u01a1 s\u1ed1 2","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Trong c\u00e1c \u0111\u00e1p \u00e1n \u0111\u1ec1u l\u00e0 c\u01a1 s\u1ed1 2 n\u00ean ta \u0111\u01b0a t\u00edch tr\u00ean v\u1ec1 d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 2 <br\/> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft 4 ; 8 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 2:<br\/> 4 = 2 . 2 = $2^?$ ; 8 = 2 . 2 . 2 = $2^?$ <br\/> B\u01b0\u1edbc 2: <\/b> \u00c1p d\u1ee5ng quy t\u1eafc nh\u00e2n hai l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 \u0111\u1ec3 nh\u00e2n c\u00e1c l\u0169y th\u1eeba tr\u00ean: <br\/> $a^m.a^n = a^{m.n}$<br\/> <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3 v\u00ec: 4 = 2 . 2 = $2^2$ <br\/> 8 = 2 . 2 . 2 = $2^3$ <br\/> N\u00ean 4 . 8 . 8 . 2 = $2^2 . 2^3. 2^3 . 2 = 2^ {2 + 3 + 3 + 1} = 2^9$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. $2^9$<\/span>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"274","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='img\/4.jpg' \/><\/center> <br\/> Vi\u1ebft g\u1ecdn t\u00edch sau d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u1ee7a m\u1ed9t s\u1ed1: <br\/> 3 . 3 . 3 . 9 . 27 = ? ","select":["A. $3^4$","B. $3^8$","C. $3^6$"],"hint":"\u0110\u01b0a t\u00edch tr\u00ean v\u1ec1 l\u0169y th\u1eeba c\u01a1 s\u1ed1 3","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Trong c\u00e1c \u0111\u00e1p \u00e1n \u0111\u1ec1u l\u00e0 c\u01a1 s\u1ed1 3 n\u00ean ta \u0111\u01b0a t\u00edch tr\u00ean v\u1ec1 d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 3 <br\/> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft 9 ; 27 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 3:<br\/> 9 = 3 . 3 = $3^?$ ; 27 = 3 . 3 . 3 = $3^?$ <br\/> B\u01b0\u1edbc 2: <\/b> \u00c1p d\u1ee5ng quy t\u1eafc nh\u00e2n hai l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 \u0111\u1ec3 nh\u00e2n c\u00e1c l\u0169y th\u1eeba tr\u00ean: <br\/> $a^m.a^n = a^{m.n}$<br\/> <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3 v\u00ec: 9 = 3 . 3 = $3^2$ <br\/> 27 = 3 . 3 . 3 = $3^3$ <br\/> N\u00ean 3 . 3 . 3 . 9 . 27 = (3 . 3 . 3) . $3^2.3^3$= $3^3 . 3^2. 3^3 = 3^ {3 + 2 + 3} = 3^8$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $3^8$<\/span>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"275","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"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":"<center><img src='img\/4.jpg' \/><\/center> <br\/> Vi\u1ebft g\u1ecdn t\u00edch sau d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba: <br\/> 7 . 7 . 7 . 21 . 3 . 3 = ? ","select":["A. $7^3.3^2$","B. $7^4.3^2$","C. $7^4.3^3$"],"hint":"\u0110\u01b0a t\u00edch tr\u00ean v\u1ec1 l\u0169y th\u1eeba c\u01a1 s\u1ed1 3 v\u00e0 7 b\u1eb1ng c\u00e1ch t\u00e1ch 21 = 3 . 7 r\u1ed3i vi\u1ebft g\u1ecdn l\u1ea1i d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Trong c\u00e1c \u0111\u00e1p \u00e1n \u0111\u1ec1u l\u00e0 c\u01a1 s\u1ed1 3 v\u00e0 7 n\u00ean ta \u0111\u01b0a t\u00edch tr\u00ean v\u1ec1 d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 3 v\u00e0 7 <br\/> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft 21 = 3 . 7<br\/> B\u01b0\u1edbc 2: <\/b> Vi\u1ebft g\u1ecdn t\u00edch tr\u00ean d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u1ee7a 3 v\u00e0 7 <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3 v\u00ec: 21 = 3 . 7 <br\/> N\u00ean 7 . 7 . 7 . 21 . 3 . 3 = 7 . 7 . 7 . (3 . 7) . 3 . 3 = (7 . 7 . 7 . 7) . (3 . 3 . 3) = $7^ 4 . 3^3$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. $7^4.3^3$<\/span>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"276","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh: $2^3 . 2^2 . 2^5 . 2$ l\u00e0:","select":["A. $2^{10}$ ","B. $2^{11}$ ","C. $2^{30}$ ","D. $16^{30}$ "],"hint":"Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169: <br\/> $a^m. a^n = a^{m + n}$ <br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $2^3 . 2^2 . 2^5 . 2 = 2^ {3 + 2 + 5 + 1} = 2^ {11}$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $2^{11}$<\/span><br\/> L\u01b0u \u00fd: a \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 $a^1$ hay s\u1ed1 m\u0169 c\u1ee7a s\u1ed1 t\u1ef1 nhi\u00ean a b\u1ea5t k\u00ec l\u00e0 1 <\/i> <\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"277","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh: $7^2 . 7^4 . 7$ l\u00e0:","select":["A. $7^{7}$ ","B. $7^{6}$ ","C. $7^{8}$ ","D. $343^{6}$ "],"hint":"Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169: <br\/> $a^m. a ^n = a^ {m + n}$ <br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $7^2 . 7^4 . 7 = 7^ {2 + 4 + 1} = 7^ 7$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. $7^7$<\/span> <br\/> L\u01b0u \u00fd: a \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 $a^1$ hay s\u1ed1 m\u0169 c\u1ee7a s\u1ed1 t\u1ef1 nhi\u00ean a b\u1ea5t k\u00ec l\u00e0 1 <\/i> <\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"278","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"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":"K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh: $5^3 . 5^2 . 5 . 5^4$ l\u00e0:","select":["A. $5^{9}$ ","B. $5^{20}$ ","C. $20^{10}$ ","D. $5^{10}$ "],"hint":"Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169: <br\/> $a^m. a ^n = a^ {m + n}$ <br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $5^3 . 5^2 . 5 . 5^4= 5^ {3 + 2 + 1 + 4} = 5^ {10}$ <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. $5^{10}$<\/span> <br\/> L\u01b0u \u00fd: a \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 $a^1$ hay s\u1ed1 m\u0169 c\u1ee7a s\u1ed1 t\u1ef1 nhi\u00ean a b\u1ea5t k\u00ec l\u00e0 1 <\/i> <\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"279","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"B\u1ea1n Lan th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh: $2^5 . 2^3 = 2^{15}$ \u0110\u00daNG <\/b> hay SAI <\/b>?","select":["A. \u0110\u00daNG ","B. SAI "],"hint":"Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169: <br\/> $a^m. a ^n = a^ {m + n}$ <br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $2^5 . 2^3= 2^ {5 + 3} = 2^ {8}$ <br\/> V\u1eady b\u1ea1n Lan th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh: '' $2^5 . 2^3 = 2^{15}$ '' l\u00e0 SAI <\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"280","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"B\u1ea1n Hu\u1ec7 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh: $3^5 . 3^8 = 3^{11}$ \u0110\u00daNG <\/b> hay SAI <\/b>?","select":["A. \u0110\u00daNG ","B. SAI "],"hint":"Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> Mu\u1ed1n nh\u00e2n c\u00e1c l\u0169y th\u1eeba c\u00f9ng c\u01a1 s\u1ed1 ta gi\u1eef nguy\u00ean c\u01a1 s\u1ed1 v\u00e0 c\u1ed9ng c\u00e1c s\u1ed1 m\u0169: <br\/> $a^m. a ^n = a^ {m + n}$ <br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $3^5 . 3^8= 3^ {5 + 8} = 3^ {13}$ <br\/> V\u1eady b\u1ea1n Hu\u1ec7 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh: '' $3^5 . 3^8 = 3^{11}$ '' l\u00e0 SAI <\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"281","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"S\u1ed1 8 \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng l\u1eadp ph\u01b0\u01a1ng c\u1ee7a s\u1ed1 t\u1ef1 nhi\u00ean n\u00e0o sau \u0111\u00e2y?","select":["A. 2 ","B. 3 ","C. 1 ","D. 4 "],"hint":"L\u1eadp ph\u01b0\u01a1ng hay ch\u00ednh l\u00e0 l\u0169y th\u1eeba b\u1eadc 3","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> C\u00e1ch 1: <\/b> Vi\u1ebft 8d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a 1 s\u1ed1 t\u1ef1 nhi\u00ean <br\/> R\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> C\u00e1ch 2: <\/b> T\u00ednh l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a t\u1eebng s\u1ed1 trong \u0111\u00e1p \u00e1n xem l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a s\u1ed1 n\u00e0o b\u1eb1ng 8 (d\u00e0i)<br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>L\u1eadp ph\u01b0\u01a1ng hay ch\u00ednh l\u00e0 l\u0169y th\u1eeba b\u1eadc 3 <br\/> V\u1eady ta \u0111i t\u00ecm xem 8 b\u1eb1ng l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a s\u1ed1 n\u00e0o<br\/> C\u00e1ch 1: <\/b> Ta c\u00f3 8 = 2 . 2 . 2= $2^3$ <br\/> V\u1eady 8 ch\u00ednh l\u00e0 l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a 2 <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 2<\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"282","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"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":"S\u1ed1 1331 \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng l\u1eadp ph\u01b0\u01a1ng c\u1ee7a s\u1ed1 t\u1ef1 nhi\u00ean n\u00e0o sau \u0111\u00e2y?","select":["A. 9 ","B. 14 ","C. 11 ","D. 12 "],"hint":"L\u1eadp ph\u01b0\u01a1ng hay ch\u00ednh l\u00e0 l\u0169y th\u1eeba b\u1eadc 3","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> C\u00e1ch 1: <\/b> Vi\u1ebft 1331 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a 1 s\u1ed1 t\u1ef1 nhi\u00ean <br\/> R\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> C\u00e1ch 2: <\/b> T\u00ednh l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a t\u1eebng s\u1ed1 trong \u0111\u00e1p \u00e1n xem l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a s\u1ed1 n\u00e0o b\u1eb1ng 1331 (d\u00e0i)<br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>L\u1eadp ph\u01b0\u01a1ng hay ch\u00ednh l\u00e0 l\u0169y th\u1eeba b\u1eadc 3 <br\/> V\u1eady ta \u0111i t\u00ecm xem 1331 b\u1eb1ng l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a s\u1ed1 n\u00e0o <br\/> C\u00e1ch 1: <\/b> Ta c\u00f3 1331 = 11 . 11 . 11 = $11^3$ <br\/> V\u1eady 1331 ch\u00ednh l\u00e0 l\u0169y th\u1eeba b\u1eadc 3 c\u1ee7a 11 <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 11<\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"283","post_id":"719","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='img\/7.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean n bi\u1ebft: $3^n. 3$ = 243 <br\/> V\u1eady n =_input_","hint":"Vi\u1ebft 243 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 3","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft 243 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 3 <br\/> B\u01b0\u1edbc 2: <\/b> Vi\u1ebft $3^n.3 = 3^ {n + 1}$ <br\/> B\u01b0\u1edbc 3: <\/b> Cho hai s\u1ed1 m\u0169 b\u1eb1ng nhau \u0111\u1ec3 t\u00ecm n<\/span> <br\/><br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} 3^n. 3 &= 243 \\\\ 3^ {n + 1} &= 3 . 3 . 3 . 3 . 3 \\\\ 3 ^{n + 1} &= 3^5\\end{align*}$ <br\/> Suy ra: n + 1 = 5 n\u00ean n = 4 <br\/> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 4 <\/span> <br\/> L\u01b0u \u00fd: $a^m = a^n $ khi v\u00e0 ch\u1ec9 khi m = n <\/i> <\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"284","post_id":"719","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='img\/7.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean n bi\u1ebft: $5 . 4^n$ + 13 = 1293 <br\/> V\u1eady n =_input_","hint":"Coi $4^n$ l\u00e0 s\u1ed1 ch\u01b0a bi\u1ebft ta \u0111i t\u00ecm $4^n$ = ? sau \u0111\u00f3 vi\u1ebft k\u1ebft qu\u1ea3 VP d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 4 \u0111\u1ec3 t\u00ecm n","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> Coi $5.4^n$ l\u00e0 s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft ta l\u1ea5y t\u1ed5ng tr\u1eeb \u0111i s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft <br\/> B\u01b0\u1edbc 2: <\/b> Coi $4^n$ l\u00e0 th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft<br\/> Mu\u1ed1n t\u00ecm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft ta l\u1ea5y t\u00edch chia cho th\u1eeba s\u1ed1 \u0111\u00e3 bi\u1ebft<br\/> B\u01b0\u1edbc 3: <\/b> Vi\u1ebft VP d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba c\u01a1 s\u1ed1 4 <br\/> Sau \u0111\u00f3 cho hai s\u1ed1 m\u0169 b\u1eb1ng nhau \u0111\u1ec3 t\u00ecm n<\/span> <br\/><br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} 5 . 4^n + 13 &= 1293 \\\\ 5. 4^ n &= 1293 - 13 \\\\ 5.4 ^n &= 1280 \\\\ 4^n &= 1280 : 5 \\\\ 4^n &= 256 \\\\ 4^n &= 4 . 4 . 4 . 4 \\\\ 4^n &= 4^4\\end{align*} $<br\/> Suy ra: n = 4 <br\/> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 4 <\/span> <br\/> L\u01b0u \u00fd: $a^m = a^n $ ($a \\neq 0, 1)$ khi v\u00e0 ch\u1ec9 khi m = n <\/i> <\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"285","post_id":"719","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["3"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='img\/11.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean x bi\u1ebft: $x^4$ = 81 <br\/> V\u1eady x =_input_","hint":"Vi\u1ebft 81 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba b\u1eadc 4 c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean ($x^4 = a^4$ suy ra x = a)","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1:<\/b> Vi\u1ebft 81 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba b\u1eadc 4 c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean <br\/> B\u01b0\u1edbc 2: <\/b> Cho hai c\u01a1 s\u1ed1 b\u1eb1ng nhau \u0111\u1ec3 t\u00ecm x<\/span> <br\/><br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: 81 = 9 . 9 = 3 . 3 . 3 . 3 = $3^4$ <br\/> V\u00ec $x^4 = 81 = 3^4$ n\u00ean x = 3 <br\/> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 3 <\/span> <br\/> L\u01b0u \u00fd: $x^m = a^m $ khi v\u00e0 ch\u1ec9 khi x = a <\/i> <\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"286","post_id":"719","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='img\/11.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean x bi\u1ebft: $x^6$ = 64 <br\/> V\u1eady x =_input_","hint":"Vi\u1ebft 64 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba b\u1eadc 6 c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean ($x^6 = a^6$ suy ra x = a)","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1:<\/b> Vi\u1ebft 64 d\u01b0\u1edbi d\u1ea1ng l\u0169y th\u1eeba b\u1eadc 4 c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean <br\/> B\u01b0\u1edbc 2: <\/b> Cho hai c\u01a1 s\u1ed1 b\u1eb1ng nhau \u0111\u1ec3 t\u00ecm x<\/span> <br\/><br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: 64 = 8 . 8 = (2 . 2 . 2) . (2 . 2 . 2) = $2^6$ <br\/> V\u00ec $x^6 = 64 = 2^6$ n\u00ean x = 2 <br\/> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 2 <\/span> <br\/> L\u01b0u \u00fd: $x^m = a^m $ khi v\u00e0 ch\u1ec9 khi x = a <\/i> <\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"287","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"H\u00e3y ch\u1ecdn d\u1ea5u th\u00edch h\u1ee3p thay cho d\u1ea5u ?<\/span> <br\/> <center><img src='img\/9.jpg' \/><\/center> <br\/> $7^3$ ?<\/span> $3^7$","select":["A. > ","B. < ","C. = "],"hint":"T\u00ednh $7^3 = ?, 3^7 = ?$ r\u1ed3i so s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> B\u01b0\u1edbc 1: <\/b> T\u00ednh $7^3 = ?$; $3^7 = ?$ <br\/> B\u01b0\u1edbc 2: <\/b> So s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3 v\u00e0 ch\u1ecdn d\u1ea5u th\u00edch h\u1ee3p<br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $7^3 = 7 . 7 . 7 = 343$ <br\/> $3^7 = 3 . 3 . 3 . 3 . 3 . 3 . 3 = 2187$ <br\/> V\u00ec 343 < 2187 n\u00ean $7^3$ < $3^7$ <\/b> <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. <<\/span>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"288","post_id":"719","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"H\u00e3y ch\u1ecdn d\u1ea5u th\u00edch h\u1ee3p thay cho d\u1ea5u ?<\/span> <br\/> <center><img src='img\/9.jpg' \/><\/center> <br\/> $4^8$ ?<\/span> $8^4$","select":["A. > ","B. < ","C. = "],"hint":"T\u00ednh $4^8 = ?, 8^4 = ?$ r\u1ed3i so s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3","explain":"H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> B\u01b0\u1edbc 1: <\/b> T\u00ednh $4^8 = ?$; $8^4 = ?$ <br\/> B\u01b0\u1edbc 2: <\/b> So s\u00e1nh c\u00e1c k\u1ebft qu\u1ea3 v\u00e0 ch\u1ecdn d\u1ea5u th\u00edch h\u1ee3p<br\/> <\/span>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $4^8 = 4 . 4 . 4 . 4 . 4 . 4 . 4 . 4 = 65536$ <br\/> $8^4 = 8 . 8 . 8 . 8 = 4096$ <br\/> V\u00ec 65536 > 4096 n\u00ean $4^8$ > $8^4$ <\/b> <br\/> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. > <\/span>","column":3}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"289","post_id":"719","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["36"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"T\u00ednh <br\/><center><img src='img\/10.jpg' \/><\/center> <br\/> $1^3+2^3+3^3$ = _input_","hint":"T\u00ednh k\u1ebft qu\u1ea3 t\u1eebng s\u1ed1 h\u1ea1ng r\u1ed3i c\u1ed9ng l\u1ea1i","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> T\u00ednh $1^3 = ?, 2^3 = ?, 3^3 = ?$<br\/> B\u01b0\u1edbc 2: <\/b> C\u1ed9ng c\u00e1c k\u1ebft qu\u1ea3 l\u1ea1i <\/span> <br\/><br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $1^3 = 1 . 1 . 1 = 1$ <br\/> $2^3 = 2 . 2 . 2 = 8$ <br\/> $3^ 3 = 3 . 3 . 3 = 27$ <br\/> N\u00ean: $1^3 + 2^3 + 3^3 = 1 + 8 + 27 = 36$ <br\/> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 36<\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"},{"id":"290","post_id":"719","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["25"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"T\u00ednh <br\/><center><img src='img\/10.jpg' \/><\/center> <br\/> $3^2+ 4^2 $= _input_","hint":"T\u00ednh k\u1ebft qu\u1ea3 t\u1eebng s\u1ed1 h\u1ea1ng r\u1ed3i c\u1ed9ng l\u1ea1i","explain":"H\u01b0\u1edbng d\u1eabn:<\/span><br\/> B\u01b0\u1edbc 1: <\/b> T\u00ednh $3^2 = ?, 4 ^2 = ?$<br\/> B\u01b0\u1edbc 2: <\/b> C\u1ed9ng c\u00e1c k\u1ebft qu\u1ea3 l\u1ea1i <\/span> <br\/><br\/> B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $3^2 = 3 . 3 = 9 $ <br\/> $4^2 = 4 . 4 = 16$ <br\/> N\u00ean: $3^2 + 4^2= 9 + 16 = 25$ <br\/> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 25<\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:14:39"}]}