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 trung bình

{"common":{"save":0,"post_id":"4597","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6749","post_id":"4597","mon_id":"1158113","chapter_id":"1158129","question":"Tính chu vi và di\u1ec7n tích c\u1ee7a hình ch\u1eef nh\u1eadt MNPQ?<\/p>Bi\u1ebft MN = 4 dm ; MQ = 2 . MN<\/span><\/p><svg height=\"150\" width=\"250\"> <g><title><\/title><rect fill=\"#fff\" height=\"152\" 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><rect fill=\"#aaff56\" height=\"109\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"209\" x=\"23.9\" y=\"25.85\"><\/rect> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"10.9\" xml:space=\"preserve\" y=\"16.85\">M<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"6.9\" xml:space=\"preserve\" y=\"140.85\">N<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_5\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"234.9\" xml:space=\"preserve\" y=\"143.85\">P<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"226.9\" xml:space=\"preserve\" y=\"20.85\">Q<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"27.9\" xml:space=\"preserve\" y=\"86.85\">4 dm<\/text> <\/g> <\/svg><\/span><\/p>Chu vi là: C = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> dm<\/p>Di\u1ec7n tích là: S = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> dm$^2$<\/span><\/p>","options":"","correct":["[\"24\",\"32\"]"],"level":"2","hint":"Tính c\u1ea1nh MQ b\u1eb1ng cách l\u1ea5y \u0111\u1ed9 dài MN nhân 2.<\/p>Chu vi hình ch\u1eef nh\u1eadt là C = 2 . (a + b)<\/p>Di\u1ec7n tích hình ch\u1eef nh\u1eadt là S = a . b<\/p>(a, b là chi\u1ec1u r\u1ed9ng và chi\u1ec1u dài c\u1ee7a hình ch\u1eef nh\u1eadt)<\/p>","answer":"Ta có: MQ = 2 . MN = 2 .4 = 8 (dm)<\/p>Chu vi hình ch\u1eef nh\u1eadt MNPQ là:<\/p>C = 2 . (MN + MQ)<\/p>    = 2 . (4 + 8)<\/p>    = 2 . 12<\/p>    = 24 (dm)<\/p>Di\u1ec7n tích hình ch\u1eef nh\u1eadt là:<\/p>S = MN . MQ<\/p>   = 4 . 8 <\/p>    = 32 (dm$^2$<\/span>)<\/p>V\u1eady chu vi là C = 24 dm<\/strong>, di\u1ec7n tích là S = 32 dm$^2$<\/span>.<\/strong><\/p>Các s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t là 24<\/strong><\/span> ; 32<\/strong><\/span><\/p>","type":"blank","extra_type":"","time":"0","user_id":"132","test":"3","date":"2021-08-28 03:07:48"},{"id":"6752","post_id":"4597","mon_id":"1158113","chapter_id":"1158129","question":"Tính \u0111\u1ed9 dài c\u1ea1nh c\u1ee7a hình vuông bi\u1ebft chu vi c\u1ee7a nó là 56 dm?<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/hinh-hoc\/h8.png\" \/><\/div>","options":["14 cm ","14 m","140 cm","120 cm"],"correct":"3","level":"2","hint":"Chu vi c\u1ee7a hình vuông là C = 4 . a (v\u1edbi a là \u0111\u1ed9 dài m\u1ed9t c\u1ea1nh c\u1ee7a hình vuông)<\/p>Suy ra a = C : 4<\/p>","answer":"G\u1ecdi \u0111\u1ed9 dài c\u1ea1nh c\u1ee7a hình vuông là x (dm)  (x > 0)<\/p>Vì chu vi c\u1ee7a hình vuông là 56 dm nên<\/p>4 . x = 56<\/p>     x = 56 : 4<\/p>     x = 14 (dm)<\/p>\u0110\u1ed5i 14 dm = 140 cm<\/p>V\u1eady \u0111\u1ed9 dài c\u1ea1nh c\u1ee7a hình vuông là 140 cm<\/strong><\/span><\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"132","test":"3","date":"2021-08-28 03:27:13","option_type":"txt","len":0},{"id":"6755","post_id":"4597","mon_id":"1158113","chapter_id":"1158129","question":"Tính di\u1ec7n tích c\u1ee7a hình sau, bi\u1ebft: AB = 7 cm, BC = 3 cm, CD = 5 cm, DE = 2 cm.<\/p><svg height=\"150\" width=\"260\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"152\" id=\"canvas_background\" width=\"262\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_14\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><image height=\"105\" id=\"svg_1\" width=\"239.00002\" x=\"8\" 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y=\"22\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"3.9\" xml:space=\"preserve\" y=\"26\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"139.9\" xml:space=\"preserve\" y=\"25\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"146.9\" xml:space=\"preserve\" y=\"83\">C<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"235.9\" xml:space=\"preserve\" y=\"81\">D<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"237.9\" xml:space=\"preserve\" y=\"140\">E<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2.9\" xml:space=\"preserve\" y=\"138\">G<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_10\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"53.9\" xml:space=\"preserve\" y=\"32\">7 cm<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_11\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"147.9\" xml:space=\"preserve\" y=\"61\">3<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_12\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"192.9\" xml:space=\"preserve\" y=\"81\">5<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_13\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"245.9\" xml:space=\"preserve\" y=\"108\">2<\/text> <line fill=\"none\" id=\"svg_15\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"11.9\" x2=\"145\" y1=\"35.85\" y2=\"35.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_16\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"12.9\" x2=\"13\" y1=\"35.85\" y2=\"117.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_17\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"144.9\" x2=\"144.9\" y1=\"35.85\" y2=\"84.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_18\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"242.9\" x2=\"242.9\" y1=\"84.85\" y2=\"116.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_19\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"12.9\" x2=\"243.9\" y1=\"117.85\" y2=\"118\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_20\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"143.9\" x2=\"242.9\" y1=\"84.85\" y2=\"84.85\"><\/line> <\/g> <\/svg><\/span><\/p>","options":["S = 45","S = 45 cm$^2$<\/span>","S = 45 cm"],"correct":"2","level":"2","hint":"Chia hình \u0111ã cho thành hai hình ch\u1eef nh\u1eadt ABFG và CDEF nh\u01b0 hình<\/p><svg height=\"150\" width=\"260\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g> <title><\/title> <rect fill=\"#fff\" height=\"152\" id=\"canvas_background\" width=\"262\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_14\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> <title><\/title> <image height=\"105\" id=\"svg_1\" width=\"239.00002\" x=\"8\" xlink:href=\"data:image\/png;base64,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\" y=\"22\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"3.9\" xml:space=\"preserve\" y=\"26\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"139.9\" xml:space=\"preserve\" y=\"25\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"146.9\" xml:space=\"preserve\" y=\"83\">C<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"235.9\" xml:space=\"preserve\" y=\"81\">D<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"237.9\" xml:space=\"preserve\" y=\"140\">E<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"143.9\" xml:space=\"preserve\" y=\"139\">F<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2.9\" xml:space=\"preserve\" y=\"138\">G<\/text> <line fill=\"none\" id=\"svg_9\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"144.9\" x2=\"144.9\" y1=\"85\" y2=\"118\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_10\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"53.9\" xml:space=\"preserve\" y=\"32\">7 cm<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_11\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"147.9\" xml:space=\"preserve\" y=\"61\">3<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_12\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"192.9\" xml:space=\"preserve\" y=\"81\">5<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_13\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"245.9\" xml:space=\"preserve\" y=\"108\">2<\/text> <line fill=\"none\" id=\"svg_15\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"11.9\" x2=\"145\" y1=\"35.85\" y2=\"35.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_16\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"12.9\" x2=\"13\" y1=\"35.85\" y2=\"117.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_17\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"144.9\" x2=\"144.9\" y1=\"35.85\" y2=\"84.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_18\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"242.9\" x2=\"242.9\" y1=\"84.85\" y2=\"116.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_19\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"12.9\" x2=\"243.9\" y1=\"117.85\" y2=\"118\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_20\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"143.9\" x2=\"242.9\" y1=\"84.85\" y2=\"84.85\"><\/line> <\/g> <\/svg><\/span><\/p>Tính di\u1ec7n tích c\u1ee7a hai hình ch\u1eef nh\u1eadt ABFG và CDEF thì di\u1ec7n tích hình \u0111ã cho b\u1eb1ng t\u1ed5ng di\u1ec7n tích c\u1ee7a hai hình ch\u1eef nh\u1eadt v\u1eeba tính.<\/p>","answer":"Ta chia hình \u0111ã cho thành hai hình ch\u1eef nh\u1eadt là ABFG và CDEF nh\u01b0 hình v\u1ebd.<\/p><svg height=\"150\" width=\"260\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g> <title><\/title> <rect fill=\"#fff\" height=\"152\" id=\"canvas_background\" width=\"262\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_14\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> <title><\/title> <image height=\"105\" id=\"svg_1\" width=\"239.00002\" x=\"8\" 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y=\"22\"><\/image> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"3.9\" xml:space=\"preserve\" y=\"26\">A<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"139.9\" xml:space=\"preserve\" y=\"25\">B<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"146.9\" xml:space=\"preserve\" y=\"83\">C<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"235.9\" xml:space=\"preserve\" y=\"81\">D<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"237.9\" xml:space=\"preserve\" y=\"140\">E<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"143.9\" xml:space=\"preserve\" y=\"139\">F<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2.9\" xml:space=\"preserve\" y=\"138\">G<\/text> <line fill=\"none\" id=\"svg_9\" stroke=\"#000\" stroke-dasharray=\"5,5\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"144.9\" x2=\"144.9\" y1=\"85\" y2=\"118\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" id=\"svg_10\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"53.9\" xml:space=\"preserve\" y=\"32\">7 cm<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_11\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"147.9\" xml:space=\"preserve\" y=\"61\">3<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_12\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"192.9\" xml:space=\"preserve\" y=\"81\">5<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"15\" font-style=\"normal\" id=\"svg_13\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"245.9\" xml:space=\"preserve\" y=\"108\">2<\/text> <line fill=\"none\" id=\"svg_15\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"11.9\" x2=\"145\" y1=\"35.85\" y2=\"35.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_16\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"12.9\" x2=\"13\" y1=\"35.85\" y2=\"117.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_17\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"144.9\" x2=\"144.9\" y1=\"35.85\" y2=\"84.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_18\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"242.9\" x2=\"242.9\" y1=\"84.85\" y2=\"116.85\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_19\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"12.9\" x2=\"243.9\" y1=\"117.85\" y2=\"118\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_20\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"143.9\" x2=\"242.9\" y1=\"84.85\" y2=\"84.85\"><\/line> <\/g> <\/svg><\/span><\/p>Ta có: <\/p>BF = BC + CF = BC + DE = 3 + 2 = 5 (cm) (vì CF = DE)<\/p>GE = GF + FE = AB + CD = 7 + 5 = 12 (cm) (vì AB = GF, FE = CD)<\/p>Di\u1ec7n tích c\u1ee7a hình ch\u1eef nh\u1eadt ABFG là:<\/p>S$_1$<\/span>= AB . BF = 7 . 5 = 35 (cm$^2$<\/span>)<\/p>Di\u1ec7n tích c\u1ee7a hình ch\u1eef nh\u1eadt CDEF là:<\/p>S$_2$<\/span>= CD . DE = 5 . 2 = 10 (cm$^2$<\/span>)<\/p>Di\u1ec7n tích c\u1ee7a hình c\u1ea7n tìm là:<\/p>S = S$_1$<\/span> + S$_2$<\/span> = 35 + 10 = 45 (cm$^2$<\/span>)<\/p>V\u1eady \u0111áp án \u0111úng là S = 45 cm$^2$<\/span><\/strong><\/span><\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"132","test":"3","date":"2021-08-28 03:37:45","option_type":"math","len":0}]}