Trung điểm của đoạn thẳng - Bài tập nâng cao số 2

Home Lớp 6 Toán lớp 6 - Sách kết nối tri thức Bài 35: Trung điểm của đoạn thẳngBài tập nâng cao

{"common":{"save":0,"post_id":"4839","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8786","post_id":"4839","mon_id":"1158113","chapter_id":"1158164","question":"Cho \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng PQ = 78,2 cm. G\u1ecdi I là trung \u0111i\u1ec3m c\u1ee7a PQ và K là trung \u0111i\u1ec3m c\u1ee7a PI. Tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng PK.<\/p><svg height=\"70\" width=\"380\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"72\" id=\"canvas_background\" width=\"382\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><image height=\"54\" id=\"svg_1\" width=\"368\" x=\"4\" xlink:href=\"data:image\/png;base64,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\" y=\"6\"><\/image> <\/g> <\/svg><\/span><\/p>","options":["PK = 19,55 cm","PK = 19,25 cm","PK = 19,35 cm","PK = 19,45 cm"],"correct":"1","level":"3","hint":"Tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng PI = $\\dfrac{PQ}{2}$<\/span>.<\/p>Sau \u0111ó tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng PK = $\\dfrac{PI}{2}$<\/span>.<\/p>","answer":"Vì I là trung \u0111i\u1ec3m c\u1ee7a PQ nên PI = QI = $\\dfrac{PQ}{2}$<\/span> = $\\dfrac{78,2}{2}$<\/span> = 39,1 cm. Suy ra PI = 39,1 cm.<\/p>Vì K là trung \u0111i\u1ec3m c\u1ee7a PI nên PK = IK = $\\dfrac{PI}{2}$<\/span> = $\\dfrac{39,1}{2}$<\/span> = 19,55 cm<\/p>V\u1eady \u0111áp án là PK = 19,55 cm <\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-10-09 03:42:06","option_type":"txt","len":1},{"id":"8788","post_id":"4839","mon_id":"1158113","chapter_id":"1158164","question":"Cho \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng AB = 124 dm. G\u1ecdi I là trung \u0111i\u1ec3m c\u1ee7a AB và K là trung \u0111i\u1ec3m c\u1ee7a BI. Tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng IK.<\/p><svg height=\"80\" width=\"370\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"82\" id=\"canvas_background\" width=\"372\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><image height=\"53\" id=\"svg_1\" width=\"356\" x=\"5\" xlink:href=\"data:image\/png;base64,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\" y=\"5.5\"><\/image> <\/g> <\/svg><\/span><\/p>\u0110áp s\u1ed1  IK = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/>dm<\/p>","options":"","correct":["[\"31\"]"],"level":"3","hint":"Tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng BI = $\\dfrac{AB}{2}$<\/span>.<\/p>Sau \u0111ó tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng IK = $\\dfrac{BI}{2}$<\/span>.<\/p>","answer":"Vì I là trung \u0111i\u1ec3m c\u1ee7a AB nên AI = BI = $\\dfrac{AB}{2}$<\/span> = $\\dfrac{124}{2}$<\/span> = 62 dm. Suy ra BI = 62 dm.<\/p>Vì K là trung \u0111i\u1ec3m c\u1ee7a BI nên BK = IK = $\\dfrac{BI}{2}$<\/span> = $\\dfrac{62}{2}$<\/span> = 31<\/span> dm.<\/p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là  31<\/strong><\/span><\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2021-10-09 03:45:44"},{"id":"8791","post_id":"4839","mon_id":"1158113","chapter_id":"1158164","question":"Cho hình ch\u1eef nh\u1eadt ABCD có giao \u0111i\u1ec3m hai \u0111\u01b0\u1eddng chéo là \u0111i\u1ec3m E.<\/p>Tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng EA bi\u1ebft \u0111\u01b0\u1eddng chéo BD = 46 cm.<\/p><svg height=\"168\" width=\"307\"> <g><title><\/title><rect fill=\"#fff\" height=\"170\" id=\"canvas_background\" width=\"309\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" wfd-invisible=\"true\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><rect fill=\"#fff\" height=\"116.99999\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"3\" width=\"220.99999\" x=\"42.83332\" y=\"35.58333\"><\/rect> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_3\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"2\" x1=\"44.83332\" x2=\"263.83331\" y1=\"36.25\" y2=\"151.24999\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_4\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"2\" x1=\"262.83332\" x2=\"44.83333\" y1=\"37.24999\" y2=\"152.24999\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"19.83332\" xml:space=\"preserve\" y=\"42.25\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"177.83332\" xml:space=\"preserve\" y=\"102.25\">E<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"19.83332\" xml:space=\"preserve\" y=\"42.25\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"270.83332\" xml:space=\"preserve\" y=\"43.25\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"270.83332\" xml:space=\"preserve\" y=\"158.25\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"22.83332\" xml:space=\"preserve\" y=\"156.25\">D<\/text> <\/g> <\/svg><\/span><\/p>","options":["23 cm","23 mm","46 cm","46 mm"],"correct":"1","level":"3","hint":"Hai \u0111\u01b0\u1eddng chéo c\u1ee7a hình ch\u1eef nh\u1eadt b\u1eb1ng nhau.<\/p>Hai \u0111\u01b0\u1eddng chéo c\u1ee7a hình ch\u1eef nh\u1eadt c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng.<\/p>","answer":"Vì ABCD là hình ch\u1eef nh\u1eadt có hai \u0111\u01b0\u1eddng chéo là AC và BD nên AC = BD = 46 cm.<\/p>Vì ABCD là hình ch\u1eef nh\u1eadt có hai \u0111\u01b0\u1eddng chéo c\u1eaft nhau t\u1ea1i \u0111i\u1ec3m E nên E là trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n th\u1eb3ng AC và \u0111o\u1ea1n th\u1eb3ng BD. Suy ra EA = EC = $\\dfrac{AC}{2}$<\/span> = $\\dfrac{46}{2}$<\/span> = 23 cm<\/span><\/p>\u0110áp án \u0111úng là  23 cm<\/strong><\/span><\/p>","type":"choose","extra_type":"shape2","time":"0","user_id":"131","test":"3","date":"2021-10-09 03:50:43","option_type":"txt","len":0}]}