Chu vi và diện tích của một số tứ giác đã học

Home Lớp 6 Toán lớp 6 - Sách kết nối tri thức Bài 20: Chu vi và diện tích của một số tứ giác đã họcBài tập nâng cao

{"common":{"save":0,"post_id":"4786","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8115","post_id":"4786","mon_id":"1158113","chapter_id":"1158129","question":"Hình vuông có di\u1ec7n tích 625 dm$^2$<\/span> thì có c\u1ea1nh b\u1eb1ng bao nhiêu?<\/p><svg height=\"140\" width=\"140\"> <g><title><\/title><rect fill=\"#fff\" height=\"142\" id=\"canvas_background\" width=\"142\" 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><rect fill=\"#aaff56\" height=\"129\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"129\" x=\"6.9\" y=\"5.85\"><\/rect> <\/g> <\/svg><\/span><\/p>\u0110\u1ed9 dài c\u1ea1nh là <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> cm.<\/strong><\/p>","options":"","correct":["[\"250\"]"],"level":"3","hint":"\u0110\u01b0a v\u1ec1 bài toán tìm x, bi\u1ebft x$^2$<\/span> = 625.<\/p>Trong \u0111ó x (dm) là c\u1ea1nh hình vuông (x > 0)<\/p>","answer":"G\u1ecdi x (dm) là c\u1ea1nh hình vuông (x > 0).<\/p>Di\u1ec7n tích hình vuông là S = 625 dm$^2$<\/span><\/p>Suy ra x$^2$<\/span> = 625<\/p>           x$^2$<\/span> = 25$^2$<\/span><\/p>       x = 25 ho\u1eb7c x = -25.<\/p>Vì x > 0 nên x = 25 dm<\/p>\u0110\u1ed5i: 25 dm = 250 cm<\/p>\u0110\u1ed9 dài c\u1ea1nh là 250 cm<\/strong><\/p>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n là 250<\/strong><\/span><\/p>","type":"blank","extra_type":"","time":"0","user_id":"132","test":"1","date":"2021-10-03 03:15:50"},{"id":"8117","post_id":"4786","mon_id":"1158113","chapter_id":"1158129","question":"M\u1ed9t khu v\u01b0\u1eddn hình ch\u1eef nh\u1eadt có chi\u1ec1u dài là  28 m, chi\u1ec1u r\u1ed9ng là  24 m. \u1ede gi\u1eefa khu v\u01b0\u1eddn, ng\u01b0\u1eddi ta xây m\u1ed9t b\u1ed3n hoa hình thoi có \u0111\u1ed9 dài hai \u0111\u01b0\u1eddng chéo là   8 m và 7 m. Tính di\u1ec7n tích ph\u1ea7n còn l\u1ea1i c\u1ee7a khu v\u01b0\u1eddn.<\/p><svg height=\"130\" width=\"250\"> <g><title><\/title><rect fill=\"#fff\" height=\"132\" id=\"canvas_background\" width=\"252\" 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><rect fill=\"#ff7f00\" height=\"116\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"231\" x=\"11.9\" y=\"5.85\"><\/rect> <path d=\"m86.4205,60.15075l40,-25.5l40,25.5l-40,25.5l-40,-25.5z\" fill=\"#56ff56\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <\/g> <\/svg><\/span><\/p>","options":["672 m$^2$<\/span>","56 m$^2$<\/span> ","644 m$^2$<\/span>"],"correct":"3","level":"3","hint":"Tính di\u1ec7n tích khu v\u01b0\u1eddn hình ch\u1eef nh\u1eadt và di\u1ec7n tích b\u1ed3n hoa hình thoi.<\/p>Di\u1ec7n tích ph\u1ea7n còn l\u1ea1i = Di\u1ec7n tích khu v\u01b0\u1eddn - Di\u1ec7n tích b\u1ed3n hoa<\/p>","answer":"Di\u1ec7n tích khu v\u01b0\u1eddn hình ch\u1eef nh\u1eadt là:<\/p>28 . 24 = 672 (m$^2$<\/span>)<\/p>Di\u1ec7n tích b\u1ed3n hoa hình thoi là:<\/p>$\\dfrac{1}{2}$<\/span> . 8 . 7 = 28 (m$^2$<\/span>)<\/p>Di\u1ec7n tích ph\u1ea7n còn l\u1ea1i là:<\/p>672 - 28 = 644 (m$^2$<\/span>)<\/p>V\u1eady \u0111áp án là   644 m<\/strong>$^2$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"3","date":"2021-10-03 03:21:03","option_type":"math","len":0},{"id":"8120","post_id":"4786","mon_id":"1158113","chapter_id":"1158129","question":"M\u1ed9t chi\u1ebfc h\u1ed9p \u0111\u01b0\u1ee3c làm t\u1eeb t\u1ea5m bìa nh\u01b0 hình v\u1ebd, các m\u1eb7t \u0111\u1ec1u là hình vuông c\u1ea1nh 12 cm. Tính di\u1ec7n tích t\u1ea5m bìa \u0111ó (b\u1ecf qua ph\u1ea7n dính keo).<\/p><svg height=\"160\" width=\"220\"> <g><title><\/title><rect fill=\"#fff\" height=\"162\" id=\"canvas_background\" width=\"222\" 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><rect fill=\"#aad4ff\" height=\"49\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"49\" x=\"8.9\" y=\"56.85\"><\/rect> <rect fill=\"#aad4ff\" height=\"49\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\" width=\"49\" x=\"57.9\" y=\"56.85\"><\/rect> <g id=\"svg_6\"> <rect fill=\"#aad4ff\" height=\"49\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"1.5\" width=\"49\" x=\"106.9\" y=\"56.85\"><\/rect> <rect fill=\"#aad4ff\" height=\"49\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"1.5\" width=\"49\" x=\"155.9\" y=\"56.85\"><\/rect> <\/g> <rect fill=\"#aad4ff\" height=\"49\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"1.5\" width=\"49\" x=\"57.9\" y=\"7.85\"><\/rect> <rect fill=\"#aad4ff\" height=\"49\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"1.5\" width=\"49\" x=\"57.9\" y=\"105.85\"><\/rect> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"8.9\" xml:space=\"preserve\" y=\"50.85\">12 cm<\/text> <\/g> <\/svg><\/span><\/p>","options":["864 cm$^2$<\/span>","846 cm$^2$<\/span>","144 cm$^2$<\/span>"],"correct":"1","level":"3","hint":"Tính di\u1ec7n tích ph\u1ea7n bìa hình vuông.<\/p>Vì mi\u1ebfng bìa \u0111\u01b0\u1ee3c ghép t\u1eeb 6 ph\u1ea7n hình vuông gi\u1ed1ng nhau có c\u1ea1nh là 12 cm nên di\u1ec7n tích t\u1ea5m bìa b\u1eb1ng sáu l\u1ea7n di\u1ec7n tích c\u1ee7a m\u1ed9t hình vuông nh\u1ecf.<\/p>","answer":"Di\u1ec7n tích c\u1ee7a m\u1ed9t ph\u1ea7n bìa hình vuông là:<\/p>12$^2$<\/span><\/strong> = 144 (cm$^2$<\/span><\/strong>)<\/p>Di\u1ec7n tích c\u1ee7a mi\u1ebfng bìa là:<\/p>6 . 144 = 864  (cm$^2$<\/span><\/strong>)<\/p>V\u1eady \u0111áp án \u0111úng là: 864 cm$^2$<\/span><\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"1","date":"2021-10-03 03:27:35","option_type":"math","len":0}]}