Hình đồng dạng - Bài tập nâng cao

Home Lớp 8 Toán lớp 8 - Sách Kết nối tri thức Bài 37. Hình đồng dạngBài tập nâng cao

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cm<\/text> <\/g> <text fill=\"#ff0000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"17\" font-weight=\"bold\" id=\"svg_24\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"307.95452\" xml:space=\"preserve\" y=\"50.88636\">2<\/text> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> Hình 2 \u0111\u1ed3ng d\u1ea1ng v\u1edbi hình 3 theo t\u1ec9 s\u1ed1 $\\dfrac{2}{3}$<\/span>","B.<\/strong> Hình 1 \u0111\u1ed3ng d\u1ea1ng v\u1edbi hình 3 theo t\u1ec9 s\u1ed1 $\\dfrac{2}{3}$<\/span>","C.<\/strong> Hình 1 \u0111\u1ed3ng d\u1ea1ng v\u1edbi hình 2 theo t\u1ec9 s\u1ed1 $\\dfrac{3}{2}$<\/span>","D.<\/strong> Hình 1 \u0111\u1ed3ng d\u1ea1ng v\u1edbi hình 2 theo t\u1ec9 s\u1ed1 $\\dfrac{2}{3}$<\/span>"],"correct":"4","level":"3","hint":"","answer":"Hình 1 \u0111\u1ed3ng d\u1ea1ng v\u1edbi hình 2 theo t\u1ec9 s\u1ed1 là: $\\dfrac{4}{6}=\\dfrac{2}{3}$<\/span><\/p>Ch\u1ecdn D.<\/strong> Hình 1 \u0111\u1ed3ng d\u1ea1ng v\u1edbi hình 2 theo t\u1ec9 s\u1ed1 $\\dfrac{2}{3}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-09-17 02:25:56","option_type":"math","len":0},{"id":"7102","post_id":"6640","mon_id":"1158921","chapter_id":"1158939","question":"Bi\u1ebft hình 1 là hình thu nh\u1ecf c\u1ee7a hình 2 theo t\u1ec9 s\u1ed1 0,8. 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y=\"54.88636\">1<\/text> <text fill=\"#ff0000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" font-weight=\"bold\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"201.95453\" xml:space=\"preserve\" y=\"29.88636\">2<\/text> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 6 x 2,5 cm","B.<\/strong> 6,25 x 2,5 cm","C.<\/strong> 6,25 x 2 cm","D.<\/strong> 6 x 3 cm"],"correct":"2","level":"3","hint":"","answer":"Gi\u1ea3 s\u1eed kích th\u01b0\u1edbc c\u1ee7a hình 2 là m<\/strong> x n<\/strong> (cm)<\/p>Vì hình 1 là hình thu nh\u1ecf c\u1ee7a hình 2 theo t\u1ec9 s\u1ed1 0,8 và hình 1 có kích th\u01b0\u1edbc là 5 x 2 cm nên<\/p>$\\dfrac{5}{m}=\\dfrac{2}{n}=0,8$<\/span><\/p>Suy ra m = 5 : 0,8 = 6,25 cm<\/p>            n = 2 : 0,8 = 2,5 cm<\/p>V\u1eady hình 2 có kích th\u01b0\u1edbc là 6,25 x 2,5 cm.<\/p>Ch\u1ecdn B.<\/strong> 6,25 x 2,5 cm<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-09-17 02:34:35","option_type":"txt","len":2},{"id":"7103","post_id":"6640","mon_id":"1158921","chapter_id":"1158939","question":"Bi\u1ebft hình 1 là hình phóng to c\u1ee7a hình 2 theo t\u1ec9 s\u1ed1 k = 1,2. 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-6.03272,-0.19642c-2.97237,-0.00859 -5.30722,0.24569 -7.4702,0.67574c-0.23308,0.04781 -0.5685,0.03938 -0.96904,-0.00653c-0.60462,-0.35972 -1.50671,-0.95896 -2.48283,-1.7374c0.75202,-0.66904 1.51331,-1.32314 2.31181,-1.95475c10.93168,-8.70159 25.99078,-14.05385 42.63231,-14.00951z\" fill=\"#d4ffaa\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\"><\/path> <\/g> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" font-weight=\"bold\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"97.95453\" xml:space=\"preserve\" y=\"155.88635\">1<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" font-weight=\"bold\" id=\"svg_13\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"301.95452\" xml:space=\"preserve\" y=\"149.88635\">2<\/text> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 22 x 17 cm","B.<\/strong> 22,5 x 17 cm","C.<\/strong> 22,5 x 17,5 cm","D.<\/strong> 22 x 17,5 cm"],"correct":"3","level":"3","hint":"","answer":"Gi\u1ea3 s\u1eed kích th\u01b0\u1edbc c\u1ee7a hình 2 là m<\/strong> x n<\/strong> (cm)<\/p>Vì hình 1 là hình phóng to c\u1ee7a hình 2 theo t\u1ec9 s\u1ed1 k = 1,2 và hình 1 có kích th\u01b0\u1edbc là 27 x 21 cm nên <\/p>$\\dfrac{27}{m}=\\dfrac{21}{n}=1,2$<\/span><\/p>Suy ra m = 27 : 1,2 = 22,5 cm<\/p>            n = 21 : 1,2 = 17,5 cm<\/p>V\u1eady hình 2 có kích th\u01b0\u1edbc là 22,5 x 17,5 cm.<\/p>Ch\u1ecdn C.<\/strong> 22,5 x 17,5 cm<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-09-17 02:36:03","option_type":"txt","len":2}]}