Trung điểm của đoạn thẳng

Home Toán lớp 6 Tập 2 Những hình hình học cơ bản Bài 35: Trung điểm của đoạn thẳngBài tập nâng cao

{"common":{"save":0,"post_id":"4668","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7294","post_id":"4668","mon_id":"1158113","chapter_id":"1158164","question":"Cho \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng PQ = 16 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=\"80\" width=\"380\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"82\" 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=\"27\" id=\"svg_1\" width=\"363\" x=\"6.5\" xlink:href=\"data:image\/png;base64,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\" y=\"23.5\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"9.9\" xml:space=\"preserve\" y=\"66\">P<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"353.9\" xml:space=\"preserve\" y=\"65\">Q<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"182.9\" xml:space=\"preserve\" y=\"64\">I<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"93.9\" xml:space=\"preserve\" y=\"65\">K<\/text> <\/g> <\/svg><\/span><\/p>","options":["PK = 8 cm","PK = 4 cm","PK = 32 cm"],"correct":"2","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> = $\\dfrac{16}{2}$<\/span> = 8 cm. Suy ra PI = 8 cm.<\/p>Vì K là trung \u0111i\u1ec3m c\u1ee7a PI nên PK = IK = $\\dfrac{PI}{2}$<\/span> = $\\dfrac{8}{2}$<\/span> = 4 cm. <\/p>V\u1eady \u0111áp án là PK = 4 cm <\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-09-06 11:48:08","option_type":"txt","len":0},{"id":"7296","post_id":"4668","mon_id":"1158113","chapter_id":"1158164","question":"Cho \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng AB = 22 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=\"70\" width=\"370\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"72\" 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=\"27\" id=\"svg_1\" width=\"363\" x=\"9.5\" xlink:href=\"data:image\/png;base64,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\" y=\"9.5\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"348.9\" xml:space=\"preserve\" y=\"50\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"13.9\" xml:space=\"preserve\" y=\"51\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"184.9\" xml:space=\"preserve\" y=\"50\">I<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"97.9\" xml:space=\"preserve\" y=\"50\">K<\/text> <\/g> <\/svg><\/span><\/p>","options":["IK = 5,5 dm","IK = 11 dm","IK = 5,5 cm"],"correct":"1","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> = $\\dfrac{22}{2}$<\/span> = 11 dm. Suy ra BI = 11 dm.<\/p>Vì K là trung \u0111i\u1ec3m c\u1ee7a BI nên BK = IK = $\\dfrac{BI}{2}$<\/span> = $\\dfrac{11}{2}$<\/span> = 5,5 dm.<\/p>V\u1eady \u0111áp án \u0111úng là IK = 5,5 dm<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-09-06 11:53:54","option_type":"txt","len":1},{"id":"7297","post_id":"4668","mon_id":"1158113","chapter_id":"1158164","question":"Cho hình vuông ABCD có hai \u0111\u01b0\u1eddng chéo AC và BD c\u1eaft nhau t\u1ea1i O. Bi\u1ebft AC = 15 cm, tính \u0111\u1ed9 dài \u0111o\u1ea1n th\u1eb3ng OA.<\/p><svg height=\"200\" width=\"220\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"202\" id=\"canvas_background\" width=\"222\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_7\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><image height=\"173.99997\" id=\"svg_1\" width=\"181.99999\" x=\"14.5\" 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\" y=\"16.5\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"17\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"6.9\" xml:space=\"preserve\" y=\"26\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"17\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"9.9\" xml:space=\"preserve\" y=\"191\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"17\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"199.9\" xml:space=\"preserve\" y=\"190\">C<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"17\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"193.9\" xml:space=\"preserve\" y=\"27\">D<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"17\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"98.9\" xml:space=\"preserve\" y=\"130\">O<\/text> <\/g> <\/svg><\/span><\/p>","options":["OA = 15 cm ","OA = 7,5 cm ","OA = 30 cm "],"correct":"2","level":"3","hint":"O là trung \u0111i\u1ec3m c\u1ee7a AC và BD.<\/p>","answer":"+ Hình vuông có hai \u0111\u01b0\u1eddng chéo c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng.<\/p>+ Vì hình vuông ABCD có hai \u0111\u01b0\u1eddng chéo AC và BD c\u1eaft nhau t\u1ea1i O nên O là trung \u0111i\u1ec3m c\u1ee7a AC và BD.<\/p>+ Vì O là trung \u0111i\u1ec3m c\u1ee7a AC nên OA = OC = $\\dfrac{AC}{2}$<\/span> = $\\dfrac{15}{2}$<\/span> = 7,5 cm. Suy ra OA = 7,5 cm.<\/p>V\u1eady \u0111áp án \u0111úng là OA = 7,5 cm    <\/strong><\/span><\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"131","test":"3","date":"2021-09-06 12:04:53","option_type":"txt","len":0}]}