Đại lượng tỉ lệ thuận

Home Toán lớp 7 - Sách KNTT Bài 22: Đại lượng tỉ lệ thuậnBài tập cơ bản

{"common":{"save":0,"post_id":"5794","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8276","post_id":"5794","mon_id":"1158532","chapter_id":"1158659","question":"N\u1ebfu \u0111\u1ea1i l\u01b0\u1ee3ng y liên h\u1ec7 v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng x theo công th\u1ee9c y = k.x (v\u1edbi k là h\u1eb1ng s\u1ed1 khác 0) thì ta nói <\/p>","options":["A.<\/strong> y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi x theo h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 k","B.<\/strong> y t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi x theo h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 k"],"correct":"1","level":"1","hint":"N\u1ebfu \u0111\u1ea1i l\u01b0\u1ee3ng y liên h\u1ec7 v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng x theo công th\u1ee9c y = k.x (v\u1edbi k là h\u1eb1ng s\u1ed1 khác 0) thì ta nói y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi x theo h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 k.<\/p>","answer":"\u0110áp án \u0111úng là  A.<\/strong> y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi x theo h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 k<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-05-28 09:08:34","option_type":"txt","len":2},{"id":"8289","post_id":"5794","mon_id":"1158532","chapter_id":"1158659","question":"Ch\u1ecdn câu \u0111úng nh\u1ea5t<\/p>N\u1ebfu \u0111\u1ea1i l\u01b0\u1ee3ng y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng x thì<\/p>","options":["A.<\/strong> T\u1ec9 s\u1ed1 hai giá tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a chúng luôn không \u0111\u1ed5i và b\u1eb1ng h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7","B.<\/strong> T\u1ec9 s\u1ed1 hai giá tr\u1ecb b\u1ea5t kì c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng này b\u1eb1ng t\u1ec9 s\u1ed1 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u01b0\u01a1ng \u1ee9ng c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng kia","C. <\/strong>C\u1ea3 A và B \u0111\u1ec1u \u0111úng","D. <\/strong>C\u1ea3 a và B \u0111\u1ec1u sai"],"correct":"3","level":"1","hint":"N\u1ebfu \u0111\u1ea1i l\u01b0\u1ee3ng y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng x thì<\/p>+ T\u1ec9 s\u1ed1 hai giá tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a chúng luôn không \u0111\u1ed5i và b\u1eb1ng h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7<\/p>+ T\u1ec9 s\u1ed1 hai giá tr\u1ecb b\u1ea5t kì c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng này b\u1eb1ng t\u1ec9 s\u1ed1 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u01b0\u01a1ng \u1ee9ng c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng kia<\/p>","answer":"A.<\/strong> T\u1ec9 s\u1ed1 hai giá tr\u1ecb t\u01b0\u01a1ng \u1ee9ng c\u1ee7a chúng luôn không \u0111\u1ed5i và b\u1eb1ng h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7  (\u0111úng)<\/p>B.<\/strong> T\u1ec9 s\u1ed1 hai giá tr\u1ecb b\u1ea5t kì c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng này b\u1eb1ng t\u1ec9 s\u1ed1 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u01b0\u01a1ng \u1ee9ng c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng kia  (\u0111úng)<\/p>\u0110áp án \u0111úng là   C. <\/strong>C\u1ea3 A và B \u0111\u1ec1u \u0111úng<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-05-28 09:37:13","option_type":"txt","len":3},{"id":"8290","post_id":"5794","mon_id":"1158532","chapter_id":"1158659","question":"Theo b\u1ea3ng giá tr\u1ecb d\u01b0\u1edbi \u0111ây, hai \u0111\u1ea1i l\u01b0\u1ee3ng x và y có ph\u1ea3i là hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn không?<\/p><table border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"height: 150px; width: 200px;\"><tbody> <tr> <td>x<\/td> <td>1<\/td> <td>2<\/td> <td>3<\/td> <\/tr> <tr> <td>y<\/td> <td>4<\/td> <td>8<\/td> <td>12<\/td> <\/tr><\/tbody><\/table>","options":["A. <\/strong>Có","B. <\/strong>Không"],"correct":"1","level":"1","hint":"N\u1ebfu y và x là hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 thu\u1eadn thì t\u1ec9 s\u1ed1 hai \u0111\u1ea1i l\u01b0\u1ee3ng t\u01b0\u01a1ng \u1ee9ng c\u1ee7a chúng luôn không \u0111\u1ed5i và cùng b\u1eb1ng h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 k, ngh\u0129a là<\/p>$\\dfrac{y_1}{x_1}=\\dfrac{y_2}{x_2}=...=k$<\/span><\/p>","answer":"Vì   $\\dfrac{4}{1}=\\dfrac{8}{2}=\\dfrac{12}{3}=4$<\/span>  nên y t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi x theo h\u1ec7 s\u1ed1 t\u1ec9 l\u1ec7 b\u1eb1ng 4.<\/p>\u0110áp án \u0111úng là   A. <\/strong>Có<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-05-28 09:45:04","option_type":"txt","len":1}]}