Bài tập cuối chương 3 - Bài tập trung bình

Home Lớp 8 Toán lớp 8 - Sách Kết nối tri thức Bài tập cuối chương 3Bài tập trung bình

{"common":{"save":0,"post_id":"6575","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6160","post_id":"6575","mon_id":"1158921","chapter_id":"1158929","question":"Tính s\u1ed1 \u0111o x trong hình bi\u1ebft ABCD là hình thang (AB \/\/ CD).<\/p><svg height=\"150\" width=\"240\"> <g><title><\/title><rect fill=\"#fff\" height=\"152\" id=\"canvas_background\" width=\"242\" 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><g id=\"svg_9\"> <path d=\"m18.08877,133.38512l60.43751,-112l108.12501,0l32.43749,112l-173.00001,0z\" fill=\"#fff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_2\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"195.31535\" xml:space=\"preserve\" y=\"123.52273\">x<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"63.31535\" xml:space=\"preserve\" y=\"19.52273\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"189.31535\" xml:space=\"preserve\" y=\"17.52273\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_5\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"219.31535\" xml:space=\"preserve\" y=\"144.52273\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"4.31535\" xml:space=\"preserve\" y=\"146.52273\">D<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"148.31535\" xml:space=\"preserve\" y=\"48.52273\">105<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"176.31535\" xml:space=\"preserve\" y=\"35.52273\">o<\/text> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 65°","B.<\/strong> 75°","C.<\/strong> 85°","D.<\/strong> 95°"],"correct":"2","level":"2","hint":"","answer":"Vì AB \/\/ CD nên <\/p>$\\widehat{B}+\\widehat{C}$<\/span> = 180°  (hai góc trong cùng phía)<\/p>105° + x = 180°<\/p>x = 180° – 105°<\/p>x = 75°<\/p>\u0110áp án \u0111úng là  B.<\/strong> 75°.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-30 01:16:17","option_type":"txt","len":0},{"id":"6162","post_id":"6575","mon_id":"1158921","chapter_id":"1158929","question":"Tính s\u1ed1 \u0111o x trong hình bi\u1ebft ABCD là hình bình hành.<\/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\" 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><g id=\"svg_9\"> <path d=\"m22.08878,106.66845l41.8,-81l167.19999,0l-41.8,81l-167.19999,0z\" fill=\"#fff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_2\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"51.31535\" xml:space=\"preserve\" y=\"20.52273\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"232.31535\" xml:space=\"preserve\" y=\"22.52273\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"188.31535\" xml:space=\"preserve\" y=\"121.52273\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_5\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"7.31535\" xml:space=\"preserve\" y=\"123.52273\">D<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"208.31535\" xml:space=\"preserve\" y=\"41.52273\">x<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"60.31535\" xml:space=\"preserve\" y=\"49.52273\">120<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"89.31535\" xml:space=\"preserve\" y=\"41.52273\">o<\/text> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 60°","B.<\/strong> 80°","C.<\/strong> 70°","D.<\/strong> 90°"],"correct":"1","level":"2","hint":"","answer":"Vì ABCD là hình bình hành nên AD \/\/ BC<\/p>⇒ $\\widehat{A}+\\widehat{B}$<\/span> = 180°  (hai góc trong cùng phía)<\/p>120° + x = 180°<\/p>x = 180° – 120°<\/p>x = 60°<\/p>\u0110áp án \u0111úng là   A.<\/strong> 60°.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-30 01:22:13","option_type":"txt","len":0},{"id":"6163","post_id":"6575","mon_id":"1158921","chapter_id":"1158929","question":"Tính s\u1ed1 góc x trong hình bi\u1ebft ABCD là hình bình hành.<\/p><svg height=\"140\" width=\"270\"> <g><title><\/title><rect fill=\"#fff\" height=\"142\" id=\"canvas_background\" width=\"272\" 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><g id=\"svg_9\"> <path d=\"m25.765,113.36208l43.6,-89l174.39999,0l-43.6,89l-174.39999,0z\" fill=\"#fff\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_2\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"63\" xml:space=\"preserve\" y=\"53.25\">120<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"93\" xml:space=\"preserve\" y=\"42.25\">o<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"186\" xml:space=\"preserve\" y=\"105.25\">x<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_5\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"54\" xml:space=\"preserve\" y=\"21.25\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_6\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"248\" xml:space=\"preserve\" y=\"23.25\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_7\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"200\" xml:space=\"preserve\" y=\"126.25\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"18\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"8\" xml:space=\"preserve\" y=\"126.25\">D<\/text> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> 100°","B.<\/strong> 60°","C.<\/strong> 120°","D.<\/strong> 80°"],"correct":"3","level":"2","hint":"","answer":"Vì ABCD là hình bình hành nên <\/p>$\\widehat{A}=\\widehat{C}$<\/span>  (các góc \u0111\u1ed1i c\u1ee7a hình bình hành b\u1eb1ng nhau)<\/p>⇒ x = 120°<\/p>\u0110áp án \u0111úng là   C.<\/strong> 120°.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2023-07-30 01:26:55","option_type":"txt","len":1}]}