Luyện tập chung

Home Lớp 5 Toán lớp 5 - Sách Kết nối tri thức Bài 29. Luyện tập chung: Hình tam giác; Diện tích hình tam giácBài tập nâng cao

{"common":{"save":0,"post_id":"7714","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1895","post_id":"7714","mon_id":"1159414","chapter_id":"1159460","question":"M\u1ed9t bi\u1ec3n báo giao thông tròn có \u0111\u01b0\u1eddng kính 70 cm. Di\u1ec7n tích ph\u1ea7n m\u0169i tên trên bi\u1ec3n báo b\u1eb1ng $\\dfrac{1}{5}$<\/span> di\u1ec7n tích c\u1ee7a bi\u1ec3n báo. Tính di\u1ec7n tích ph\u1ea7n m\u0169i tên? <svg height=\"200\" width=\"200\"> <g><title><\/title><rect fill=\"none\" height=\"202\" id=\"canvas_background\" width=\"202\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_3\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><ellipse cx=\"99.5\" cy=\"96.75\" fill=\"#00ffff\" id=\"svg_1\" rx=\"80\" ry=\"80\" stroke=\"#00ffff\" stroke-width=\"1.5\"><\/ellipse> <path d=\"m57.08751,93.89695l43.5,-74.81999l43.5,74.81999l-21.75,0l0,75.18001l-43.5,0l0,-75.18001l-21.75,0z\" fill=\"#ffffff\" id=\"svg_2\" stroke=\"#00ffff\" stroke-width=\"1.5\"><\/path> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 769,3 cm²","B.<\/strong> 793,6 cm²","C.<\/strong> 763,9 cm²","D.<\/strong> 736,9 cm²"],"correct":"1","level":"3","hint":"","answer":"Ch\u1ecdn A.<\/strong> 769,3 cm².<\/span><\/p>Bán kính hình tròn là 70 : 2 = 35 (cm). Di\u1ec7n tích hình tròn là 3,14 x 35 x 35 = 3846,5 (cm²). Di\u1ec7n tích ph\u1ea7n m\u0169i tên là 3846,5 x $\\dfrac{1}{5}$<\/span> = 769,3 (cm²).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-24 02:24:34","option_type":"txt","len":2},{"id":"1898","post_id":"7714","mon_id":"1159414","chapter_id":"1159460","question":"Cho hình tròn tâm O bán kính 8cm. Bi\u1ebft di\u1ec7n tích ph\u1ea7n không tô màu b\u1eb1ng $\\dfrac{15}{24}$<\/span> di\u1ec7n tích hình tròn. Di\u1ec7n tích tam giác ABC là:<\/p><svg height=\"230\" width=\"225\"> <g><title><\/title><rect fill=\"#fff\" height=\"232\" id=\"canvas_background\" width=\"227\" 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><ellipse cx=\"109.5\" cy=\"126.25\" fill=\"#fff\" id=\"svg_1\" rx=\"100\" ry=\"100\" stroke=\"#ff0000\" stroke-width=\"3\"><\/ellipse> <path d=\"m24.22001,175.09189l85.5,-146.99999l85.5,146.99999l-171,0z\" fill=\"#ff0000\" id=\"svg_2\" stroke=\"#ff0000\" stroke-width=\"3\"><\/path> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#ff0000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"102\" xml:space=\"preserve\" y=\"19.25\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_4\" stroke=\"#ff0000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"3\" xml:space=\"preserve\" y=\"199.25\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_5\" stroke=\"#ff0000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"203\" xml:space=\"preserve\" y=\"194.25\">C<\/text> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 72,36 cm²","B.<\/strong> 72,56 cm²","C.<\/strong> 75,56 cm²","D.<\/strong> 75,36 cm²"],"correct":"4","level":"3","hint":"","answer":"Ch\u1ecdn D.<\/strong> 75,36 cm².<\/span><\/p>Di\u1ec7n tích hình tròn là 8 x 8 x 3,14 = 200,96 (cm²).<\/p>Di\u1ec7n tích ph\u1ea7n không tô màu là 200,96 x $\\dfrac{15}{24}$<\/span> = 125,6 (cm²).<\/p>Di\u1ec7n tích tam giác ABC là 200,96 – 125,6 = 75,36 (cm²).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-24 02:31:36","option_type":"txt","len":2},{"id":"1900","post_id":"7714","mon_id":"1159414","chapter_id":"1159460","question":"M\u1ed9t m\u1ea3nh v\u01b0\u1eddn hình vuông có c\u1ea1nh 9m. \u1ede gi\u1eefa v\u01b0\u1eddn ng\u01b0\u1eddi ta \u0111ào m\u1ed9t cái ao nh\u1ecf \u0111\u1ec3 trang trí có bán kính 1,6m. V\u1eady di\u1ec7n tích ph\u1ea7n \u0111\u1ea5t còn l\u1ea1i là<\/p>","options":["A.<\/strong> 76,9612 m²","B.<\/strong> 76,9616 m²","C.<\/strong> 72,9616 m²","D.<\/strong> 76,9216 m²"],"correct":"3","level":"3","hint":"","answer":"Ch\u1ecdn C.<\/strong> 72,9616 m².<\/span><\/p>Di\u1ec7n tích m\u1ea3nh v\u01b0\u1eddn hình vuông là 9 x 9 = 81 (m²). Di\u1ec7n tích cái gi\u1ebfng là 3,14 x 1,6 x 1,6 = 8,0384 (m²). Di\u1ec7n tích ph\u1ea7n \u0111\u1ea5t còn l\u1ea1i là 81 – 8,0384 = 72,9616 (m²).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-24 02:35:22","option_type":"txt","len":2}]}