Ôn tập chương 4 Hình học phẳng- Bài tập nâng cao số 2

Home Toán lớp 6 (Sách KNTT)Toán lớp 6 Tập 1 Ôn tập chương 4: Một số hình phẳng trong thực tiễnBài tập nâng cao

{"common":{"save":0,"post_id":"4622","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6950","post_id":"4622","mon_id":"1158113","chapter_id":"1158129","question":"M\u1ed9t m\u1ea3nh v\u01b0\u1eddn có hình d\u1ea1ng nh\u01b0 hình d\u01b0\u1edbi \u0111ây. N\u1ebfu m\u1ed9t túi h\u1ea1t gi\u1ed1ng c\u1ecf gieo v\u1eeba \u0111\u1ee7 trên 33 m$^2$<\/span> \u0111\u1ea5t thì c\u1ea7n bao nhiêu túi h\u1ea1t gi\u1ed1ng \u0111\u1ec3 gieo h\u1ebft c\u1ea3 m\u1ea3nh v\u01b0\u1eddn.<\/p><svg height=\"140\" width=\"220\"> <g><title><\/title><rect fill=\"#fff\" height=\"142\" 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><path d=\"m11.7255,116.78075l36.75,-101l122.50001,0l36.74999,101l-196,0z\" fill=\"#d4ffaa\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <line fill=\"none\" id=\"svg_2\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"48.9\" x2=\"48.9\" y1=\"15.85\" y2=\"116.85\"><\/line> <rect fill=\"#d4ffaa\" height=\"9\" id=\"svg_3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\" width=\"10\" x=\"48.9\" y=\"107.85\"><\/rect> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"90.9\" xml:space=\"preserve\" y=\"31.85\">40 m<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_5\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"109.9\" xml:space=\"preserve\" y=\"107.85\">50 m<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"56.9\" xml:space=\"preserve\" y=\"65.85\">11 m<\/text> <\/g> <\/svg><\/span><\/p>","options":["16 túi","15 túi","495 túi"],"correct":"2","level":"3","hint":"B\u01b0\u1edbc 1: Tính di\u1ec7n tích c\u1ee7a m\u1ea3nh v\u01b0\u1eddn.<\/p>B\u01b0\u1edbc 2: Tính s\u1ed1 túi h\u1ea1t gi\u1ed1ng c\u1ea7n dùng = di\u1ec7n tích c\u1ee7a m\u1ea3nh v\u01b0\u1eddn : 33<\/p>","answer":"M\u1ea3nh v\u01b0\u1eddn có d\u1ea1ng hình thang cân có hai \u0111áy là 40 m và 50 m; chi\u1ec1u cao là 11 m.<\/p>Di\u1ec7n tích c\u1ee7a m\u1ea3nh v\u01b0\u1eddn là:<\/p>S = $\\dfrac{1}{2}$<\/span> . (40 + 50) . 11<\/p>   = $\\dfrac{1}{2}$<\/span> . 90 . 11<\/p>   = 45 . 11 = 495 (m$^2$<\/span>)<\/p>Vì m\u1ed9t túi h\u1ea1t gi\u1ed1ng c\u1ecf gieo v\u1eeba \u0111\u1ee7 trên 33 m$^2$<\/span> \u0111\u1ea5t nên s\u1ed1 túi h\u1ea1t gi\u1ed1ng c\u1ea7n dùng là:<\/p>495 : 33 = 15 (túi)<\/p>V\u1eady c\u1ea7n dùng 15 túi h\u1ea1t gi\u1ed1ng \u0111\u1ec3 gieo h\u1ebft m\u1ea3nh v\u01b0\u1eddn.<\/p>\u0110áp án là 15 túi<\/strong><\/span><\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"132","test":"3","date":"2021-08-31 02:33:15","option_type":"txt","len":0},{"id":"6986","post_id":"4622","mon_id":"1158113","chapter_id":"1158129","question":"Trong các kh\u1eb3ng \u0111\u1ecbnh sau, có bao nhiêu kh\u1eb3ng \u0111\u1ecbnh \u0111úng?<\/p>1\/ Hình thoi có chu vi là 40 dm thì có c\u1ea1nh là 10 dm.<\/p>2\/ Hình vuông có di\u1ec7n tích là 100 m$^2$<\/span> thì có c\u1ea1nh là 1 m<\/p>3\/ Hình vuông có c\u1ea1nh là 12 cm thì có chu vi là 48 cm$^2$<\/span><\/p>4\/ Hình ch\u1eef nh\u1eadt có các c\u1ea1nh \u0111\u1ed1i vuông góc v\u1edbi nhau.<\/p>","options":["1","2","3","4"],"correct":"1","level":"3","hint":"1\/ Tính c\u1ea1nh c\u1ee7a hình thoi có chu vi là 40 dm<\/p>2\/ Tính c\u1ea1nh c\u1ee7a hình vuông có di\u1ec7n tích là 100 m$^2$<\/span> <\/p>3\/ Tính chu vi c\u1ee7a hình vuông có c\u1ea1nh là 12 cm<\/p>4\/ D\u1ef1a vào m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 c\u01a1 b\u1ea3n c\u1ee7a hình ch\u1eef nh\u1eadt<\/p>","answer":"Xét các kh\u1eb3ng \u0111\u1ecbnh:<\/p>1\/ Hình thoi có chu vi là 40 dm thì có c\u1ea1nh là 10 dm.  \u0110úng<\/span> vì c\u1ea1nh c\u1ee7a hình thoi này b\u1eb1ng 40 : 4 = 10 dm<\/strong><\/p>2\/ Hình vuông có di\u1ec7n tích là 100 m$^2$<\/span> thì có c\u1ea1nh là 1 m  Sai<\/span> vì 100 = 10$^2$<\/span> nên c\u1ea1nh c\u1ee7a nó là 10m<\/strong><\/p>3\/ Hình vuông có c\u1ea1nh là 12 cm thì có chu vi là 48 cm$^2$<\/span>  <\/span>Sai<\/span> vì chu vi c\u1ee7a nó là 4 .12 = 48 cm<\/strong> (không ph\u1ea3i cm$^2$<\/span>)<\/p>4\/ Hình ch\u1eef nh\u1eadt có các c\u1ea1nh \u0111\u1ed1i vuông góc v\u1edbi nhau.   Sai<\/span> vì hình ch\u1eef nh\u1eadt có các c\u1ea1nh \u0111\u1ed1i song song<\/strong> v\u1edbi nhau<\/p>V\u1eady có 1 kh\u1eb3ng \u0111\u1ecbnh \u0111úng<\/strong>. (Ch\u1ecdn \u0111áp án 1<\/strong><\/span>)<\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"132","test":"3","date":"2021-08-31 13:39:57","option_type":"txt","len":0},{"id":"6990","post_id":"4622","mon_id":"1158113","chapter_id":"1158129","question":"Tính di\u1ec7n tích m\u1ea3nh \u0111\u1ea5t hình bình hành ABCD, bi\u1ebft AH = 40 dm, DH = 30 dm, CH = 70 dm.<\/p><svg height=\"160\" width=\"250\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"162\" id=\"canvas_background\" width=\"252\" 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=\"146\" id=\"svg_2\" stroke=\"null\" width=\"239.99999\" x=\"2\" 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y=\"3\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"29.9\" xml:space=\"preserve\" y=\"20\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"229.9\" xml:space=\"preserve\" y=\"14\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"194.9\" xml:space=\"preserve\" y=\"149\">C<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"9.9\" xml:space=\"preserve\" y=\"149\">D<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"44.9\" xml:space=\"preserve\" y=\"149\">H<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"-506.1\" xml:space=\"preserve\" y=\"-97\"><\/text> <\/g> <\/svg><\/span><\/p>Di\u1ec7n tích hình bình hành là: S = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> m$^2$<\/span><\/p>","options":"","correct":["[\"40\"]"],"level":"3","hint":"B\u01b0\u1edbc 1: Tính c\u1ea1nh CD = CH + DH.<\/p>B\u01b0\u1edbc 2: Tính di\u1ec7n tích hình bình hành ABCD.<\/p>Chú ý \u0111\u1ec1 yêu c\u1ea7u \u0111\u01a1n v\u1ecb m$^2$<\/span>  nên em c\u1ea7n \u0111\u1ed5i t\u1eeb \u0111\u01a1n v\u1ecb dm$^2$<\/span> sang m$^2$<\/span> <\/strong>(b\u1eb1ng cách chia cho 100).<\/p>","answer":"Ta có CD = CH + DH = 30 + 70 = 100 dm<\/p>Di\u1ec7n tích c\u1ee7a hình bình hành ABCD là:<\/p>S = AH . CD = 40 . 100 = 4000 (dm$^2$<\/span>) <\/p>V\u1eady di\u1ec7n tích là S = 4000 dm$^2$<\/span>  = 40 m$^2$<\/span>.<\/p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là 40<\/strong><\/span>.<\/p>","type":"blank","extra_type":"","time":"0","user_id":"132","test":"3","date":"2021-08-31 14:01:49"}]}