Giải hệ hai phương trình bậc nhất hai ẩn

Home Lớp 9 Toán lớp 9 - Sách Kết nối tri thức Bài 2: Giải hệ hai phương trình bậc nhất hai ẩnBài tập cơ bản

{"common":{"save":0,"post_id":"7373","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6966","post_id":"7373","mon_id":"1159278","chapter_id":"1159281","question":"Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng trình b\u1eadc nh\u1ea5t m\u1ed9t \u1ea9n b\u1eb1ng ph\u01b0\u01a1ng pháp th\u1ebf, ta th\u1ef1c hi\u1ec7n nh\u01b0 sau:<\/p>","options":["A.<\/strong> Tr\u1eeb t\u1eebng v\u1ebf c\u1ee7a hai ph\u01b0\u01a1ng trình trong h\u1ec7 \u0111\u1ec3 \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình ch\u1ec9 còn m\u1ed9t \u1ea9n.","B.<\/strong> C\u1ed9ng t\u1eebng v\u1ebf c\u1ee7a hai ph\u01b0\u01a1ng trình trong h\u1ec7 \u0111\u1ec3 \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình ch\u1ec9 còn m\u1ed9t \u1ea9n.","C.<\/strong> T\u1eeb m\u1ed9t ph\u01b0\u01a1ng trình c\u1ee7a h\u1ec7, bi\u1ec3u di\u1ec5n m\u1ed9t \u1ea9n theo \u1ea9n kia r\u1ed3i th\u1ebf vào ph\u01b0\u01a1ng trình còn l\u1ea1i c\u1ee7a h\u1ec7.","D.<\/strong> C\u1ed9ng hay tr\u1eeb t\u1eebng v\u1ebf c\u1ee7a hai ph\u01b0\u01a1ng trình trong h\u1ec7 \u0111\u1ec3 \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình ch\u1ec9 còn m\u1ed9t \u1ea9n."],"correct":"3","level":"1","hint":"","answer":"Ch\u1ecdn C.<\/strong> T\u1eeb m\u1ed9t ph\u01b0\u01a1ng trình c\u1ee7a h\u1ec7, bi\u1ec3u di\u1ec5n m\u1ed9t \u1ea9n theo \u1ea9n kia r\u1ed3i th\u1ebf vào ph\u01b0\u01a1ng trình còn l\u1ea1i c\u1ee7a h\u1ec7.<\/span><\/p>Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng trình b\u1eadc nh\u1ea5t m\u1ed9t \u1ea9n b\u1eb1ng ph\u01b0\u01a1ng pháp th\u1ebf, ta th\u1ef1c hi\u1ec7n nh\u01b0 sau: T\u1eeb m\u1ed9t ph\u01b0\u01a1ng trình c\u1ee7a h\u1ec7, bi\u1ec3u di\u1ec5n m\u1ed9t \u1ea9n theo \u1ea9n kia r\u1ed3i th\u1ebf vào ph\u01b0\u01a1ng trình còn l\u1ea1i c\u1ee7a h\u1ec7.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-09-30 01:42:20","option_type":"txt","len":3},{"id":"6968","post_id":"7373","mon_id":"1159278","chapter_id":"1159281","question":"Cho h\u1ec7 ph\u01b0\u01a1ng trình sau $\\begin{cases}x-4y=1\\text{ (1)}\\\\3x-y=5\\text{ (2)}\\end{cases}$<\/span>. Ch\u1ecdn kh\u1eb3ng \u0111\u1ecbnh \u0111úng.<\/p>","options":["A.<\/strong> Bi\u1ebfn \u0111\u1ed5i y theo x thì (1) vi\u1ebft l\u1ea1i thành: $y=\\dfrac{1-x}{4}$<\/span>.","B.<\/strong> Bi\u1ebfn \u0111\u1ed5i x theo y thì (2) vi\u1ebft l\u1ea1i thành: $x=\\dfrac{5-y}{3}$<\/span>.","C.<\/strong> Nhân hai v\u1ebf c\u1ee7a ph\u01b0\u01a1ng trình th\u1ee9 (2) v\u1edbi 4 ta \u0111\u01b0\u1ee3c: 12x – 4y = 20.","D.<\/strong> H\u1ec7 ph\u01b0\u01a1ng trình có nghi\u1ec7m $\\bigg(\\dfrac{1}{11};\\dfrac{2}{11}\\bigg)$<\/span>."],"correct":"3","level":"1","hint":"","answer":"Ch\u1ecdn C.<\/strong> Nhân hai v\u1ebf c\u1ee7a ph\u01b0\u01a1ng trình th\u1ee9 (2) v\u1edbi 4 ta \u0111\u01b0\u1ee3c: 12x – 4y = 20.<\/span><\/p>Nhân hai v\u1ebf c\u1ee7a ph\u01b0\u01a1ng trình th\u1ee9 (2) v\u1edbi 4 ta \u0111\u01b0\u1ee3c: 12x – 4y = 20.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-09-30 01:48:23","option_type":"math","len":0},{"id":"6970","post_id":"7373","mon_id":"1159278","chapter_id":"1159281","question":"Cho h\u1ec7 ph\u01b0\u01a1ng trình sau $\\begin{cases}3x-4y=1\\text{ (1)}\\\\3x-y=5\\text{ (2)}\\end{cases}$<\/span>. Ch\u1ecdn kh\u1eb3ng \u0111\u1ecbnh \u0111úng.<\/p>","options":["A.<\/strong> Tr\u1eeb t\u1eebng v\u1ebf hai ph\u01b0\u01a1ng trình, ta \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình m\u1ed9t \u1ea9n là: 3y = –4.","B.<\/strong> Tr\u1eeb t\u1eebng v\u1ebf hai ph\u01b0\u01a1ng trình, ta \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình m\u1ed9t \u1ea9n là: 3x = –4.","C.<\/strong> Tr\u1eeb t\u1eebng v\u1ebf hai ph\u01b0\u01a1ng trình, ta \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình m\u1ed9t \u1ea9n là: –3y = 4.","D.<\/strong> Tr\u1eeb t\u1eebng v\u1ebf hai ph\u01b0\u01a1ng trình, ta \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình m\u1ed9t \u1ea9n là: \n–3y = –4."],"correct":"4","level":"1","hint":"","answer":"Ch\u1ecdn D.<\/strong> Tr\u1eeb t\u1eebng v\u1ebf hai ph\u01b0\u01a1ng trình, ta \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng trình m\u1ed9t \u1ea9n là: –3y = –4.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-09-30 01:52:41","option_type":"txt","len":3}]}