Phép nhân số thập phân

Home Lớp 5 Toán lớp 5 - Sách Kết nối tri thức Bài 21. Phép nhân số thập phânBài tập nâng cao

{"common":{"save":0,"post_id":"7675","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1661","post_id":"7675","mon_id":"1159414","chapter_id":"1159449","question":"Tìm m\u1ed9t s\u1ed1 bi\u1ebft r\u1eb1ng n\u1ebfu gi\u1ea3m s\u1ed1 \u0111ó \u0111i 4 l\u1ea7n, \u0111\u01b0\u1ee3c bao nhiêu b\u1edbt \u0111i 62,8 thì \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 là 134.<\/p>","options":["A.<\/strong> 787,2","B.<\/strong> 786,2","C.<\/strong> 886,2","D.<\/strong> 887,2"],"correct":"1","level":"3","hint":"","answer":"Ch\u1ecdn A.<\/strong> 787,2.<\/span><\/p>Tr\u01b0\u1edbc khi b\u1edbt \u0111i 62,8 là s\u1ed1 134 + 62,8 =196,8. S\u1ed1 ban \u0111\u1ea7u là: 196,8 x 4 = 787,2.<\/p><svg height=\"110\" width=\"230\"> <g><title><\/title><rect fill=\"#ffffaa\" height=\"112\" id=\"canvas_background\" width=\"232\" 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><text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"29\" xml:space=\"preserve\" y=\"25.25\">134<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"2\" xml:space=\"preserve\" y=\"44.25\">+<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"41\" xml:space=\"preserve\" y=\"61.25\">62,8<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"29\" xml:space=\"preserve\" y=\"93.25\">196,8<\/text> <line fill=\"none\" id=\"svg_5\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"23\" x2=\"94\" y1=\"70.25\" y2=\"70.25\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"147\" xml:space=\"preserve\" y=\"25\">196,8<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"123\" xml:space=\"preserve\" y=\"42.25\">x<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"194\" xml:space=\"preserve\" y=\"61\">4<\/text> <line fill=\"none\" id=\"svg_9\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"148\" x2=\"221\" y1=\"70.25\" y2=\"70.25\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_10\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"147\" xml:space=\"preserve\" y=\"93.25\">787,2<\/text> <\/g> <\/svg><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-19 01:54:13","option_type":"txt","len":0},{"id":"1664","post_id":"7675","mon_id":"1159414","chapter_id":"1159449","question":"M\u1ed9t c\u1eeda hàng bu\u1ed5i sáng bán \u0111\u01b0\u1ee3c 45,2m v\u1ea3i. Bu\u1ed5i chi\u1ec1u bán \u0111\u01b0\u1ee3c g\u1ea5p hai l\u1ea7n bu\u1ed5i sáng. H\u1ecfi ngày hôm \u0111ó c\u1eeda hàng bán \u0111\u01b0\u1ee3c bao nhiêu mét v\u1ea3i?<\/p>","options":["A.<\/strong> 130,6 m","B.<\/strong> 135,6 m","C.<\/strong> 132,6 m","D.<\/strong> 136,6 m"],"correct":"2","level":"3","hint":"","answer":"Ch\u1ecdn B.<\/strong> 135,6 m.<\/span><\/p>Bu\u1ed5i chi\u1ec1u bán \u0111\u01b0\u1ee3c s\u1ed1 mét v\u1ea3i là 45,2 x 2 = 90,4 (m). Ngày hôm \u0111ó c\u1eeda hàng bán \u0111\u01b0\u1ee3c s\u1ed1 mét v\u1ea3i là 45,2 + 90,4 = 135,6 (m).<\/p><svg height=\"130\" width=\"220\"> <g><title><\/title><rect fill=\"#aaffaa\" height=\"132\" 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><text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"32\" xml:space=\"preserve\" y=\"25.25\">45,2<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"5\" xml:space=\"preserve\" y=\"47.25\">x<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"65\" xml:space=\"preserve\" y=\"72.25\">2<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"32\" xml:space=\"preserve\" y=\"109.25\">90,4<\/text> <line fill=\"none\" id=\"svg_5\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"20\" x2=\"83\" y1=\"82\" y2=\"82.25\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"153\" xml:space=\"preserve\" y=\"25.25\">45,2<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"126\" xml:space=\"preserve\" y=\"47.25\">+<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"153\" xml:space=\"preserve\" y=\"70.25\">90,4<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"139\" xml:space=\"preserve\" y=\"109.25\">135,6<\/text> <line fill=\"none\" id=\"svg_10\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"141\" x2=\"204\" y1=\"82\" y2=\"82.25\"><\/line> <\/g> <\/svg><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-19 01:58:36","option_type":"txt","len":0},{"id":"1667","post_id":"7675","mon_id":"1159414","chapter_id":"1159449","question":"M\u1ed9t th\u1eeda ru\u1ed9ng hình ch\u1eef nh\u1eadt có chi\u1ec1u r\u1ed9ng 18,5 m; chi\u1ec1u dài h\u01a1n chi\u1ec1u r\u1ed9ng 6,2 m. Di\u1ec7n tích c\u1ee7a th\u1eeda ru\u1ed9ng \u0111ó là:<\/p>","options":["A.<\/strong> 465,95 m²","B.<\/strong> 456,59 m²","C.<\/strong> 456,95 m²","D.<\/strong> 465,59 m²"],"correct":"3","level":"3","hint":"","answer":"Ch\u1ecdn C.<\/strong> 456,95 m².<\/span><\/p>Chi\u1ec1u dài th\u1eeda ru\u1ed9ng \u0111ó là: 18,5 + 6,2 = 24,7 (m). Di\u1ec7n tích c\u1ee7a th\u1eeda ru\u1ed9ng \u0111ó là: 24,7 x 18,5 = 456,95 (m²).<\/p><svg height=\"210\" width=\"230\"> <g> <title><\/title> <rect fill=\"#ffd4aa\" height=\"212\" id=\"canvas_background\" width=\"232\" 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> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"26\" xml:space=\"preserve\" y=\"25.25\">18,5<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"5\" xml:space=\"preserve\" y=\"44.25\">+<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"39\" xml:space=\"preserve\" y=\"63.25\">6,2<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"26\" xml:space=\"preserve\" y=\"102.25\">24,7<\/text> <line fill=\"none\" id=\"svg_5\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"14\" x2=\"79\" y1=\"72.25\" y2=\"72\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"154\" xml:space=\"preserve\" y=\"25.25\">24,7<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_7\" stroke=\"#000\" stroke-width=\"0\" style=\"cursor: move;\" text-anchor=\"start\" x=\"133\" xml:space=\"preserve\" y=\"44.25\">x<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"154\" xml:space=\"preserve\" y=\"63.25\">18,5<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"147\" xml:space=\"preserve\" y=\"102.25\">1235<\/text> <line fill=\"none\" id=\"svg_10\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"142\" x2=\"207\" y1=\"72.25\" y2=\"72\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_11\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"134\" xml:space=\"preserve\" y=\"132.25\">1976<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_13\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"134\" xml:space=\"preserve\" y=\"162\">247<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_15\" stroke=\"#000\" stroke-width=\"0\" text-anchor=\"start\" x=\"134\" xml:space=\"preserve\" y=\"200\">456,95<\/text> <line fill=\"none\" id=\"svg_16\" stroke=\"#000\" stroke-linecap=\"undefined\" stroke-linejoin=\"undefined\" stroke-width=\"1.5\" x1=\"130\" x2=\"212\" y1=\"175.25\" y2=\"175.25\"><\/line> <\/g> <\/svg><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-19 02:05:35","option_type":"txt","len":2}]}