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Home Lớp 7 Toán lớp 7 - Sách kết nối tri thức Tỉ lệ thứcBài tập cơ bản

{"common":{"save":0,"post_id":"971","level":1,"total":20,"point":5,"point_extra":0},"segment":[{"id":"251","post_id":"971","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":"<center><img src='img\/4.jpg' \/><\/center> T\u00ecm $x$ trong t\u1ec9 l\u1ec7 th\u1ee9c sau: $ x : 6 = 4 : 3 $ ","select":["A. $x = 8 $ ","B. $x = 4,5$ ","C. $x = 2$ ","D. $x = 24$ "],"explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Trong t\u1ec9 l\u1ec7 th\u1ee9c $ a : b = c : d $ \u0111\u00e3 bi\u1ebft $b, c, d$ th\u00ec $a = \\dfrac{bc}{d}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ee7a t\u1ec9 l\u1ec7 th\u1ee9c ta c\u00f3: <br\/> $ x : 6 = 4 : 3 $ $\\Rightarrow x = \\dfrac{6.4}{3} = 8 $ <br\/> V\u1eady gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u00e0 $ 8 $ <br\/> <br\/> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span>","column":2}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:45"},{"id":"252","post_id":"971","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-7,5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" T\u00ecm $x$ trong t\u1ec9 l\u1ec7 th\u1ee9c: $ \\dfrac{3}{x} = \\dfrac{2}{-5} $<br\/> \u0110\u00e1p s\u1ed1: <\/b> $x = $ _input_ <br\/> (Vi\u1ebft k\u1ebft qu\u1ea3 d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n)","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Trong t\u1ec9 l\u1ec7 th\u1ee9c $\\dfrac{a}{b} = \\dfrac{c}{d}$ \u0111\u00e3 bi\u1ebft $a, c, d$ th\u00ec $b = \\dfrac{ad}{c}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ee7a t\u1ec9 l\u1ec7 th\u1ee9c ta c\u00f3: <br\/> $ \\dfrac{3}{x} = \\dfrac{2}{-5} \\Rightarrow x = \\dfrac{3.(-5)}{2} = -7,5 $ <br\/> <br\/> V\u1eady gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u00e0 $ -7,5 $ <\/span><\/span>"}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:45"},{"id":"253","post_id":"971","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["5,25"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" T\u00ecm $x$ trong t\u1ec9 l\u1ec7 th\u1ee9c: $ \\dfrac{0,12}{3} = \\dfrac{0,21}{x}$ <br\/> \u0110\u00e1p s\u1ed1: <\/b> $x = $ _input_ <br\/> (Vi\u1ebft k\u1ebft qu\u1ea3 d\u01b0\u1edbi d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n)","explain":" H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Trong t\u1ec9 l\u1ec7 th\u1ee9c $\\dfrac{a}{b} = \\dfrac{c}{d}$ \u0111\u00e3 bi\u1ebft $a, b, c$ th\u00ec $d = \\dfrac{bc}{a}$ <\/span> <br\/><br\/>B\u00e0i gi\u1ea3i:<\/span><br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ee7a t\u1ec9 l\u1ec7 th\u1ee9c ta c\u00f3: <br\/> <br\/> $ \\dfrac{0,12}{3} = \\dfrac{0,21}{x} \\Rightarrow x = \\dfrac{3.0,21}{0,12} = 5,25 $ <br\/> <br\/> V\u1eady gi\u00e1 tr\u1ecb c\u1ee7a $x$ l\u00e0 $ 5,25 $ <\/span><\/span>"}]}]},"correct":"","level":"1","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:45"}]}