{"segment":[{"time":24,"part":[{"time":3,"title":"N\u1ed1i t\u1eeb ho\u1eb7c c\u1ee5m t\u1eeb \u1edf c\u1ed9t b\u00ean tr\u00e1i v\u1edbi c\u1ed9t b\u00ean ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e2u ho\u00e0n ch\u1ec9nh","title_trans":"Tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 $Oxy$, h\u00e3y t\u00ecm t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m: ","audio":"","temp":"matching","correct":[["2","4","1","3"]],"list":[{"point":10,"image":"","left":["C\u00e1c \u0111i\u1ec3m c\u00f3 ho\u00e0nh \u0111\u1ed9 b\u1eb1ng $-1$ ","C\u00e1c \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng $-1$","C\u00e1c \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng ho\u00e0nh \u0111\u1ed9","C\u00e1c \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng s\u1ed1 \u0111\u1ed1i c\u1ee7a ho\u00e0nh \u0111\u1ed9"],"right":["n\u1eb1m tr\u00ean tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (I) v\u00e0 (III)","n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi tr\u1ee5c tung, c\u1eaft tr\u1ee5c ho\u00e0nh t\u1ea1i \u0111i\u1ec3m c\u00f3 ho\u00e0nh \u0111\u1ed9 b\u1eb1ng $-1$","n\u1eb1m tr\u00ean tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (II) v\u00e0 (IV)","n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c tung, c\u1eaft tr\u1ee5c tung t\u1ea1i \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng $-1$"],"top":100,"explain":"C\u00e1c \u0111i\u1ec3m c\u00f3 ho\u00e0nh \u0111\u1ed9 b\u1eb1ng $-1$ n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi tr\u1ee5c tung, c\u1eaft tr\u1ee5c ho\u00e0nh t\u1ea1i \u0111i\u1ec3m c\u00f3 ho\u00e0nh \u0111\u1ed9 b\u1eb1ng $-1$ <br\/> C\u00e1c \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng $-1$ n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c tung, c\u1eaft tr\u1ee5c tung t\u1ea1i \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng $-1$ <br\/> C\u00e1c \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng ho\u00e0nh \u0111\u1ed9 n\u1eb1m tr\u00ean tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (I) v\u00e0 (III). <br\/> C\u00e1c \u0111i\u1ec3m c\u00f3 tung \u0111\u1ed9 b\u1eb1ng s\u1ed1 \u0111\u1ed1i c\u1ee7a ho\u00e0nh \u0111\u1ed9 n\u1eb1m tr\u00ean tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (II) v\u00e0 (IV). "}]}],"id_ques":751},{"time":14,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["1"],["-2"],["-1"],["2"],["3"],["4"],["-3"],["-4"]]],"list":[{"point":10,"width":50,"type_input":"","ques":" \u0110i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng \u1edf b\u1ea3ng sau c\u00e1c t\u1ecda \u0111\u1ed9 c\u1ee7a c\u00e1c \u0111i\u1ec3m t\u01b0\u01a1ng \u1ee9ng. <br\/> <table><tr><th>\u0110i\u1ec3m<\/th><th>\u0110i\u1ec3m \u0111\u1ed1i x\u1ee9ng qua tr\u1ee5c Ox<\/th><th>\u0110i\u1ec3m \u0111\u1ed1i x\u1ee9ng qua tr\u1ee5c Oy<\/th><\/tr><tr><td>A(1; 2)<\/td><td>(_input_; _input_)<\/td><td>(_input_; _input_)<\/td><\/tr><tr><td>B(3; -4)<\/td><td>(_input_; _input_)<\/td><td>(_input_;_input_)<\/td><\/tr><\/table>","explain":" - Hai \u0111i\u1ec3m \u0111\u1ed1i x\u1ee9ng qua tr\u1ee5c Ox c\u00f3 ho\u00e0nh \u0111\u1ed9 b\u1eb1ng nhau, tung \u0111\u1ed9 \u0111\u1ed1i nhau. <br\/> - \u0110i\u1ec3m \u0111\u1ed1i x\u1ee9ng qua tr\u1ee5c Oy c\u00f3 tung \u0111\u1ed9 b\u1eb1ng nhau, ho\u00e0nh \u0111\u1ed9 \u0111\u1ed1i nhau. <br\/> Suy ra k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c cho d\u01b0\u1edbi b\u1ea3ng sau: <br\/> <table><tr><th>\u0110i\u1ec3m<\/th><th>\u0110i\u1ec3m \u0111\u1ed1i x\u1ee9ng qua tr\u1ee5c Ox<\/th><th>\u0110i\u1ec3m \u0111\u1ed1i x\u1ee9ng qua tr\u1ee5c Oy<\/th><\/tr><tr><td>$A(1; 2)$<\/td><td>$(1; -2)$<\/td><td>$(-1; 2)$<\/td><\/tr><tr><td>$B(3; -4)$<\/td><td>$(3; 4)$<\/td><td>$(-3; -4)$<\/td><\/tr><\/table> "}]}],"id_ques":752},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":" Cho tam gi\u00e1c $ABC$ v\u1edbi $A(1; 1), B(4; 3)$ v\u00e0 $C(3; 4).$ Tam gi\u00e1c $ABC$ l\u00e0 tam gi\u00e1c g\u00ec? ","select":["A. Tam gi\u00e1c vu\u00f4ng ","B. Tam gi\u00e1c \u0111\u1ec1u ","C. Tam gi\u00e1c c\u00e2n ","D. Tam gi\u00e1c vu\u00f4ng c\u00e2n "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm \u0111\u00e1p \u00e1n. ","explain":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-51.png' \/><\/center> Ta c\u00f3: $AC^{2} = 2^{2} + 3^{2} = 13 \\\\ AB^{2} = 3^{2} + 2^{2} = 13 \\\\ \\Rightarrow AC = AB $ <br\/> $BC^{2} = 1^{2} + 1^{2} = 2 \\\\ \\Rightarrow BC \\neq AC $ <br\/> V\u1eady tam gi\u00e1c $ABC$ l\u00e0 tam gi\u00e1c c\u00e2n t\u1ea1i A. <br\/> <br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span> ","column":2}]}],"id_ques":753},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":10,"ques":" Cho c\u00e1c \u0111i\u1ec3m $M(2; 3), N(-2; 3), P(2; -3) v\u00e0 Q(-2; -3).$ C\u1eb7p \u0111i\u1ec3m n\u00e0o t\u1ea1o th\u00e0nh \u0111o\u1ea1n th\u1eb3ng song song v\u1edbi tr\u1ee5c ho\u00e0nh? ","select":["A. M v\u00e0 N; P v\u00e0 Q ","B. M v\u00e0 P ","C. P v\u00e0 Q","D. N v\u00e0 P; M v\u00e0 Q "],"hint":"V\u1ebd h\u00ecnh r\u1ed3i t\u00ecm \u0111\u00e1p \u00e1n. ","explain":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-52.png' \/><\/center> Bi\u1ec3u di\u1ec5n c\u00e1c \u0111i\u1ec3m M(2; 3), N(-2; 3), P(2; -3) v\u00e0 Q(-2; -3) tr\u00ean h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 $Oxy$. <br\/> C\u1eb7p \u0111i\u1ec3m song vong v\u1edbi Ox l\u00e0: M v\u00e0 N; P v\u00e0 Q <br\/> <br\/><span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span> ","column":2}]}],"id_ques":754},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["0"],["5"]]],"list":[{"point":10,"width":20,"content":"","type_input":"","ques":"Tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9, b\u1ea1n An v\u1ebd m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 ba \u0111\u1ec9nh l\u1ea7n l\u01b0\u1ee3t l\u00e0: g\u1ed1c t\u1ecda \u0111\u1ed9, \u0111i\u1ec3m (5; 0) v\u00e0 \u0111i\u1ec3m (5; 5). V\u1eady t\u1ecda \u0111\u1ed9 \u0111\u1ec9nh th\u1ee9 t\u01b0 l\u00e0? <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $(\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}; \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{})$","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-47.png' \/><\/center> <br\/> V\u1ebd c\u00e1c \u0111i\u1ec3m: g\u1ed1c t\u1ecda \u0111\u1ed9 (0; 0), \u0111i\u1ec3m (5; 0) v\u00e0 \u0111i\u1ec3m (5; 5) l\u00ean h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 $Oxy$. <br\/> V\u00ec h\u00ecnh \u0111\u00e3 cho l\u00e0 h\u00ecnh vu\u00f4ng n\u00ean t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111\u1ec9nh th\u1ee9 t\u01b0 l\u00e0: (0 ;5) <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0 $0; 5$ <\/span>"}]}],"id_ques":755},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":" Cho h\u00ecnh v\u1ebd, c\u00e2u tr\u1ea3 l\u1eddi n\u00e0o sau \u0111\u00e2y l\u00e0 sai? <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-54.png' \/><\/center>","select":["A. Hai \u0111i\u1ec3m A v\u00e0 B c\u00f3 c\u00f9ng ho\u00e0nh \u0111\u1ed9 c\u00f2n tung \u0111\u1ed9 \u0111\u1ed1i nhau.","B. Hai \u0111i\u1ec3m A v\u00e0 C c\u00f3 c\u00f9ng tung \u0111\u1ed9 c\u00f2n ho\u00e0nh \u0111\u1ed9 \u0111\u1ed1i nhau. ","C. Tam gi\u00e1c $ABC$ l\u00e0 tam gi\u00e1c vu\u00f4ng c\u00e2n \u1edf \u0111\u1ec9nh A. ","D. Di\u1ec7n t\u00edch tam gi\u00e1c $ABC$ l\u00e0 10 (\u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch) "],"explain":" Ta c\u00f3 t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m A(2; 2,5); B(2; -2,5); C(-2; 2,5) <br\/> Hai \u0111i\u1ec3m A v\u00e0 B c\u00f3 c\u00f9ng ho\u00e0nh \u0111\u1ed9 c\u00f2n tung \u0111\u1ed9 \u0111\u1ed1i nhau. <br\/> Hai \u0111i\u1ec3m A v\u00e0 C c\u00f3 c\u00f9ng tung \u0111\u1ed9 c\u00f2n ho\u00e0nh \u0111\u1ed9 \u0111\u1ed1i nhau. <br\/> Tam gi\u00e1c $ABC$ vu\u00f4ng t\u1ea1i A. <br\/> C\u00f3 AB = 2,5 + 2,5 = 5 (\u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i) <br\/> AC = 2 + 2 = 4 (\u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i) <br\/> $AB \\neq AC $ n\u00ean $\\triangle $ABC$ $ kh\u00f4ng ph\u1ea3i l\u00e0 tam gi\u00e1c vu\u00f4ng c\u00e2n. <br\/> Di\u1ec7n t\u00edch tam gi\u00e1c $ABC$ l\u00e0: <br\/> $S_{$ABC$} = \\dfrac{1}{2}AB.AC = \\dfrac{1}{2}.5.4 = 10 $ (\u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch) <br\/> <br\/><span class='basic_pink'> C\u00e2u tr\u1ea3 l\u1eddi sai l\u00e0 C. <\/span> ","column":2}]}],"id_ques":756},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["9"]]],"list":[{"point":10,"width":20,"content":"","type_input":"","ques":" <span class='basic_left'> V\u1ebd m\u1ed9t h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 $Oxy,$ v\u1edbi \u0111\u01a1n v\u1ecb tr\u00ean hai tr\u1ee5c b\u1eb1ng nhau v\u00e0 b\u1eb1ng 0,5cm. C\u00e1c \u0111i\u1ec3m $ A(1; 2), B(7; 2), C(7; 8), D(1; 8).$ T\u00ednh di\u1ec7n t\u00edch c\u1ee7a t\u1ee9 gi\u00e1c $ABCD.$ <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}(cm^{2})$ <\/span> ","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-55.png' \/><\/center> <br\/> Ta c\u00f3: $AB = 7 - 1 = 6$ (\u0111\u01a1n v\u1ecb) <br\/> $AD = 8 - 2 = 6$ (\u0111\u01a1n v\u1ecb) <br\/> $AB = AD = 6.0,5 = 3$ (cm) <br\/> T\u1ee9 gi\u00e1c $ABCD$ l\u00e0 h\u00ecnh vu\u00f4ng. <br\/> Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng $ABCD$ l\u00e0: <br\/> $S_{ABCD} = AB.AD $$= 3.3 = 9 (cm^{2}) $ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 9<\/span>"}]}],"id_ques":757},{"time":14,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"B\u00e0i n\u00e0y g\u1ed3m 2 c\u00e2u h\u1ecfi.","temp":"fill_the_blank","correct":[[["16"],["16"]]],"list":[{"point":10,"width":50,"type_input":"","ques":" <span class='basic_left'>Tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 $Oxy,$ cho h\u00ecnh vu\u00f4ng $ABCD$ bi\u1ebft $A(2; 6), B(2; 2)$ v\u00e0 $C(6; 2).$ <br\/> <u> C\u00e2u 1: <\/u> T\u00ednh chu vi v\u00e0 di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng $ABCD$ <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> Chu vi b\u1eb1ng $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{} \\quad $ (\u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i)<br\/> $\\qquad $ Di\u1ec7n t\u00edch: = $\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{} \\quad $ (\u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch)<\/span> ","hint":"X\u00e1c \u0111\u1ecbnh t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m D c\u1ee7a h\u00ecnh vu\u00f4ng $ABC$D.","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-43.png' \/><\/center> <span class='basic_left'> <br\/> Bi\u1ec3u di\u1ec5n c\u00e1c \u0111i\u1ec3m $A(2; 6), B(2; 2)$ v\u00e0 $C(6; 2)$ tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 $Oxy$. <br\/> Theo b\u00e0i c\u00f3 $ABCD$ l\u00e0 h\u00ecnh vu\u00f4ng n\u00ean t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m $D$ l\u00e0 $D(6; 6)$ <br\/> C\u00f3 $BC = 4$ (\u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i) <br\/> Chu vi h\u00ecnh vu\u00f4ng $ABCD$ b\u1eb1ng $4.4 = 16$ (\u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i) <br\/> Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng $ABCD$ b\u1eb1ng: $4^{2} = 16 $ (\u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch) <\/span> <br\/><br\/> <span class='basic_pink'>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0 $16; 16$<\/span> "}]}],"id_ques":758},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","f","t","f"]],"list":[{"point":10,"ques":"<span class='basic_left'>Tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 $Oxy,$ cho h\u00ecnh vu\u00f4ng $ABCD$ bi\u1ebft $A(2; 6), B(2; 2)$ v\u00e0 $C(6; 2).$<br\/><u> C\u00e2u 2: <\/u> C\u00e1c kh\u1eb3ng \u0111\u1ecbnh sau \u0111\u00fang hay sai?<\/span> ","image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":["\u0110i\u1ec3m D thu\u1ed9c tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (I). ","\u0110i\u1ec3m D thu\u1ed9c tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (II).","Ba \u0111i\u1ec3m O, B, D th\u1eb3ng h\u00e0ng.","Tam gi\u00e1c AOC l\u00e0 tam gi\u00e1c \u0111\u1ec1u. "],"explain":[" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-44.png' \/><\/center> \u0110\u00fang. V\u00ec: <br\/> \u0110i\u1ec3m D(6; 6) c\u00f3 ho\u00e0nh \u0111\u1ed9 v\u00e0 tung \u0111\u1ed9 \u0111\u1ec1u d\u01b0\u01a1ng n\u00ean n\u00f3 thu\u1ed9c tia ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c ph\u1ea7n t\u01b0 th\u1ee9 (I) v\u00e0 (IV). ","<br\/>Sai. V\u00ec \u0111i\u1ec3m D(6; 6) c\u00f3 ho\u00e0nh \u0111\u1ed9 d\u01b0\u01a1ng. ","<br\/>\u0110\u00fang. ","<br\/> Sai. <br\/> C\u00f3 $OC^{2} = 6^{2} + 2^{2} = 40 \\\\ OA^{2} = 6^{2} + 2^{2} = 40 \\\\ \\Rightarrow OC = OA $ <br\/> Nh\u01b0ng $AC^{2} = 4^{2} + 4^{2} = 32 \\neq 40 $ n\u00ean $AC \\neq OC $ v\u00e0 $AC \\neq OA $ <br\/> V\u1eady tam gi\u00e1c AOC kh\u00f4ng l\u00e0 tam gi\u00e1c \u0111\u1ec1u. "]}]}],"id_ques":759},{"time":14,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["14"]]],"list":[{"point":10,"width":50,"type_input":"","ques":" <span class='basic_left'>V\u1ebd tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 $Oxy$ c\u00e1c \u0111i\u1ec3m A, B v\u00e0 C. <br\/> T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c $ABC$ bi\u1ebft: <br\/> \u0110i\u1ec3m A c\u00f3 t\u1ecda \u0111\u1ed9 $x_{0}; y_{0} $ m\u00e0 $x_{0} + 1 = 0 $ v\u00e0 $y_{0} - 2 = 0 $ <br\/> \u0110i\u1ec3m B c\u00f3 t\u1ecda \u0111\u1ed9 $x_{1}; y_{1} $ m\u00e0 $ (x_{1} - 2 )^{2} + (y_{1} + 3)^{2} = 0 $ <br\/> \u0110i\u1ec3m C c\u00f3 t\u1ecda \u0111\u1ed9 $x_{2}; y_{2} $ m\u00e0 $|x_{2} - 4 | + \\sqrt{y_{2}-3} = 0 $ <br\/> \u0110\u00e1p \u00e1n: $S_{$ABC$} = \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{} $ (\u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch) <\/span> ","explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai16/lv3/img\/D7B16-42.png' \/><\/center> <span class='basic_left'> \u0110i\u1ec3m A c\u00f3 t\u1ecda \u0111\u1ed9 $x_{0}; y_{0} $ m\u00e0: $\\left\\{ \\begin{aligned} {{x}_{0}}+1=0 \\\\ {{y}_{0}}-2=0 \\\\ \\end{aligned} \\right.\\Leftrightarrow \\left\\{ \\begin{aligned} {{x}_{0}}=-1 \\\\ {{y}_{0}}=2 \\\\ \\end{aligned} \\right.$ <br\/> $\\Rightarrow$ T\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m $A$ l\u00e0 $A(-1; 2)$ <br\/> \u0110i\u1ec3m B c\u00f3 t\u1ecda \u0111\u1ed9 $x_{1}; y_{1} $ m\u00e0 $ {{({{x}_{1}}-2)}^{2}}+{{({{y}_{1}}+3)}^{2}}=0$ $\\Leftrightarrow \\left\\{ \\begin{aligned} & {{x}_{1}}-2=0 \\\\ & {{y}_{1}}+3=0 \\\\ \\end{aligned} \\right.$ $\\Leftrightarrow \\left\\{\\begin{aligned} & {{x}_{1}}=2 \\\\ & {{y}_{1}}=-3 \\\\ \\end{aligned} \\right. $ <br\/> $\\Rightarrow$ T\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m $B$ l\u00e0 $B(2; -3)$ <br\/> \u0110i\u1ec3m C c\u00f3 t\u1ecda \u0111\u1ed9 $x_{2}; y_{2} $ m\u00e0 $\\left| {{x}_{2}}-4 \\right|+\\sqrt{{{y}_{2}}-3}=0\\Leftrightarrow \\left\\{ \\begin{aligned} & {{x}_{2}} - 4=0 \\\\ & {{y}_{2}}-3=0 \\\\ \\end{aligned} \\right.\\Leftrightarrow \\left\\{\\begin{aligned} & {{x}_{2}}=4 \\\\ & {{y}_{2}}=3 \\\\ \\end{aligned} \\right.$ <br\/> $\\Rightarrow$ T\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m $C$ l\u00e0 $C(4; 3)$ <br\/> Qua \u0111i\u1ec3m A v\u00e0 C v\u1ebd c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi tr\u1ee5c tung<br\/> Qua \u0111i\u1ec3m B v\u00e0 C v\u1ebd c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi tr\u1ee5c ho\u00e0nh.<br\/> G\u1ecdi giao \u0111i\u1ec3m c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3 l\u00e0 M, N, P. <br\/> C\u00f3 $S_{CMNP} = 5.6 = 30 \\\\ S_{CMA} = \\dfrac{1}{2}.5.1 = 2,5 \\\\ S_{ANB} = \\dfrac{1}{2}.5.3 = 7,5 \\\\ S_{BPC} = \\dfrac{1}{2}.2.6 = 6 $ <br\/> V\u1eady $S_{$ABC$} = 30 - (2,5 + 7,5 + 6) = 14 $(\u0111\u01a1n v\u1ecb di\u1ec7n t\u00edch) <br\/><br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 14 <\/span> <\/span> "}]}],"id_ques":760}],"lesson":{"save":0,"level":3}}