Tỉ số lượng giác của góc nhọn

Home Lớp 9 Toán lớp 9 - Sách Kết nối tri thức Bài 11. Tỉ số lượng giác của góc nhọn.Bài tập cơ bản

{"common":{"save":0,"post_id":"7844","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7794","post_id":"7844","mon_id":"1159278","chapter_id":"1159328","question":"Cho tam giác ABC nh\u01b0 hình v\u1ebd. Ch\u1ecdn \u0111áp án \u0111úng<\/strong>:<\/p><svg height=\"170\" width=\"260\"> <g><title><\/title><rect fill=\"#fff\" height=\"172\" id=\"canvas_background\" width=\"262\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_2\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><path d=\"m30.54932,137.4151l0,-110.99999l207.99997,110.99999l-207.99997,0z\" fill=\"#aaffd4\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\"><\/path> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_3\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"10.86363\" xml:space=\"preserve\" y=\"145.52272\">A<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"231.86362\" xml:space=\"preserve\" y=\"157.52272\">C<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_5\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"13.86363\" xml:space=\"preserve\" y=\"25.52272\">B<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Georgia, Times, ’Times New Roman’, serif\" font-size=\"24\" font-style=\"italic\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"175.86363\" xml:space=\"preserve\" y=\"131.52272\">a<\/text> <rect fill=\"#fff\" fill-opacity=\"null\" height=\"14\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\" width=\"14\" x=\"30.86363\" y=\"123.52272\"><\/rect> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"17\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"rotate(-90 13.073783874511735,84.7045364379883) \" x=\"-16.13637\" xml:space=\"preserve\" y=\"90.52272\">c\u1ea1nh \u0111\u1ed1i<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"17\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" x=\"79.86363\" xml:space=\"preserve\" y=\"155.52272\">c\u1ea1nh k\u1ec1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"’Times New Roman’, Times, serif\" font-size=\"17\" id=\"svg_13\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"rotate(27.183626174926758 134.9129638671875,65.7045440673828) \" x=\"95.86363\" xml:space=\"preserve\" y=\"71.52272\">c\u1ea1nh huy\u1ec1n<\/text> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> $\\sin\\alpha=\\dfrac{AC}{BC}$<\/span>","B.<\/strong> $\\cos\\alpha=\\dfrac{AB}{BC}$<\/span>","C.<\/strong> $\\tan\\alpha=\\dfrac{AB}{AC}$<\/span>","D.<\/strong> $\\cot\\alpha=\\dfrac{BC}{AC}$<\/span>"],"correct":"3","level":"1","hint":"","answer":"Ch\u1ecdn C.<\/strong> $\\tan\\alpha=\\dfrac{AB}{AC}$<\/span><\/span><\/p>T\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i và c\u1ea1nh k\u1ec1 \u0111\u01b0\u1ee3c g\u1ecdi là tang c\u1ee7a góc α, kí hi\u1ec7u tanα.<\/p>Xét tam giác ABC ta có: $\\tan\\alpha=\\dfrac{AB}{AC}$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-16 01:48:17","option_type":"math","len":0},{"id":"7797","post_id":"7844","mon_id":"1159278","chapter_id":"1159328","question":"Cho góc nh\u1ecdn α. Ch\u1ecdn \u0111áp án \u0111úng<\/strong>:<\/p>","options":["A.<\/strong> $\\sin\\alpha\\le1$<\/span>","B.<\/strong> $\\cos\\alpha\\ge1$<\/span>","C.<\/strong> $\\tan\\alpha\\le1$<\/span>","D.<\/strong> $\\cot\\alpha\\ge1$<\/span>"],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A.<\/strong> $\\sin\\alpha\\le1$<\/span><\/span><\/p>Sin, côsin c\u1ee7a góc nh\u1ecdn luôn d\u01b0\u01a1ng và bé h\u01a1n 1 vì trong tam giác vuông, c\u1ea1nh huy\u1ec1n dài nh\u1ea5t.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-16 01:53:30","option_type":"math","len":0},{"id":"7799","post_id":"7844","mon_id":"1159278","chapter_id":"1159328","question":"Cho góc nh\u1ecdn α. Xét tam giác ABC vuông t\u1ea1i A có m\u1ed9t góc nh\u1ecdn là α. Ch\u1ecdn \u0111áp án \u0111úng<\/strong>:<\/p>","options":["A.<\/strong> T\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i và c\u1ea1nh huy\u1ec1n \u0111\u01b0\u1ee3c g\u1ecdi là sin c\u1ee7a góc α, kí hi\u1ec7u sinα.","B.<\/strong> T\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh k\u1ec1 và c\u1ea1nh huy\u1ec1n \u0111\u01b0\u1ee3c g\u1ecdi là côsin c\u1ee7a góc α, kí hi\u1ec7u cotα.","C.<\/strong> T\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i và c\u1ea1nh k\u1ec1 \u0111\u01b0\u1ee3c g\u1ecdi là tang c\u1ee7a góc α, kí hi\u1ec7u cotα.","D.<\/strong> T\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh k\u1ec1 và c\u1ea1nh \u0111\u1ed1i \u0111\u01b0\u1ee3c g\u1ecdi là côtang c\u1ee7a góc α, kí hi\u1ec7u tanα."],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A.<\/strong> T\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i và c\u1ea1nh huy\u1ec1n \u0111\u01b0\u1ee3c g\u1ecdi là sin c\u1ee7a góc α, kí hi\u1ec7u sinα.<\/span><\/p>B.<\/strong> sai vì t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh k\u1ec1 và c\u1ea1nh huy\u1ec1n \u0111\u01b0\u1ee3c g\u1ecdi là côsin c\u1ee7a góc α, kí hi\u1ec7u cosα<\/span><\/strong>.<\/p>C.<\/strong> sai vì t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i và c\u1ea1nh k\u1ec1 \u0111\u01b0\u1ee3c g\u1ecdi là tang c\u1ee7a góc α, kí hi\u1ec7u tanα<\/strong><\/span>.<\/p>D.<\/strong> sai vì t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh k\u1ec1 và c\u1ea1nh \u0111\u1ed1i \u0111\u01b0\u1ee3c g\u1ecdi là côtang c\u1ee7a góc α, kí hi\u1ec7u cotα<\/strong><\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-16 01:57:28","option_type":"txt","len":3}]}