Selfomy Hỏi Đáp - Toán lớp 9 - Các câu hỏi gần đây https://selfomy.com/hoidap/questions/h%E1%BB%8Dc-t%E1%BA%ADp/to%C3%A1n/to%C3%A1n-l%E1%BB%9Bp-9 Powered by Question2Answer giải phương trình sau https://selfomy.com/hoidap/474335/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-sau Toán lớp 9 https://selfomy.com/hoidap/474335/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-sau Fri, 01 Mar 2024 10:32:07 +0000 Cho tam giác ABC có ba góc nhọn. Kẻ đường cao AD và BE (D ∈ DB và E ∈ AC) https://selfomy.com/hoidap/474338/cho-tam-gi%C3%A1c-abc-c%C3%B3-ba-g%C3%B3c-nh%E1%BB%8Dn-k%E1%BA%BB-%C4%91%C6%B0%E1%BB%9Dng-cao-ad-v%C3%A0-be-d-%E2%88%88-db-v%C3%A0-e-%E2%88%88-ac Toán lớp 9 https://selfomy.com/hoidap/474338/cho-tam-gi%C3%A1c-abc-c%C3%B3-ba-g%C3%B3c-nh%E1%BB%8Dn-k%E1%BA%BB-%C4%91%C6%B0%E1%BB%9Dng-cao-ad-v%C3%A0-be-d-%E2%88%88-db-v%C3%A0-e-%E2%88%88-ac Fri, 01 Mar 2024 10:32:05 +0000 Mội hình nón có bán kính đường tròn đáy là 5 cm ... https://selfomy.com/hoidap/474337/m%E1%BB%99i-h%C3%ACnh-n%C3%B3n-c%C3%B3-b%C3%A1n%C2%A0k%C3%ADnh-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-%C4%91%C3%A1y-l%C3%A0-5-cm Toán lớp 9 https://selfomy.com/hoidap/474337/m%E1%BB%99i-h%C3%ACnh-n%C3%B3n-c%C3%B3-b%C3%A1n%C2%A0k%C3%ADnh-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-%C4%91%C3%A1y-l%C3%A0-5-cm Fri, 01 Mar 2024 10:32:05 +0000 Trong mặt phẳng tọa độ Oxy, cho parabol (P): y = x^2 và đường thẳng (d): y = -2x + 3 https://selfomy.com/hoidap/474336/trong-m%E1%BA%B7t-ph%E1%BA%B3ng-t%E1%BB%8Da-%C4%91%E1%BB%99-oxy-cho-parabol-y-x-2-v%C3%A0-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-d-y-2x Toán lớp 9 https://selfomy.com/hoidap/474336/trong-m%E1%BA%B7t-ph%E1%BA%B3ng-t%E1%BB%8Da-%C4%91%E1%BB%99-oxy-cho-parabol-y-x-2-v%C3%A0-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-d-y-2x Fri, 01 Mar 2024 10:32:05 +0000 Giải bài toán sau bằng cách lập phương trình: https://selfomy.com/hoidap/474315/gi%E1%BA%A3i-b%C3%A0i-to%C3%A1n-sau-b%E1%BA%B1ng-c%C3%A1ch-l%E1%BA%ADp-ph%C6%B0%C6%A1ng-tr%C3%ACnh Toán lớp 9 https://selfomy.com/hoidap/474315/gi%E1%BA%A3i-b%C3%A0i-to%C3%A1n-sau-b%E1%BA%B1ng-c%C3%A1ch-l%E1%BA%ADp-ph%C6%B0%C6%A1ng-tr%C3%ACnh Wed, 28 Feb 2024 20:57:01 +0000 a) Vẽ đồ thị của hàm số (P): y = 2x^2 https://selfomy.com/hoidap/474314/a-v%E1%BA%BD-%C4%91%E1%BB%93-th%E1%BB%8B-c%E1%BB%A7a-h%C3%A0m-s%E1%BB%91-p-y-2x-2 Toán lớp 9 https://selfomy.com/hoidap/474314/a-v%E1%BA%BD-%C4%91%E1%BB%93-th%E1%BB%8B-c%E1%BB%A7a-h%C3%A0m-s%E1%BB%91-p-y-2x-2 Wed, 28 Feb 2024 20:57:01 +0000 Trong mặt phẳng tọa độ Oxy, cho hàm số y = 2x^2 có đồ thị (P). Vẽ đồ thị (P) https://selfomy.com/hoidap/474285/trong-m%E1%BA%B7t-ph%E1%BA%B3ng-t%E1%BB%8Da-%C4%91%E1%BB%99-oxy-cho-h%C3%A0m-s%E1%BB%91-y-2x-2-c%C3%B3-%C4%91%E1%BB%93-th%E1%BB%8B-p-v%E1%BA%BD-%C4%91%E1%BB%93-th%E1%BB%8B-p Toán lớp 9 https://selfomy.com/hoidap/474285/trong-m%E1%BA%B7t-ph%E1%BA%B3ng-t%E1%BB%8Da-%C4%91%E1%BB%99-oxy-cho-h%C3%A0m-s%E1%BB%91-y-2x-2-c%C3%B3-%C4%91%E1%BB%93-th%E1%BB%8B-p-v%E1%BA%BD-%C4%91%E1%BB%93-th%E1%BB%8B-p Mon, 26 Feb 2024 12:05:53 +0000 Tính giá trị biểu thức https://selfomy.com/hoidap/474286/t%C3%ADnh-gi%C3%A1-tr%E1%BB%8B-bi%E1%BB%83u-th%E1%BB%A9c Toán lớp 9 https://selfomy.com/hoidap/474286/t%C3%ADnh-gi%C3%A1-tr%E1%BB%8B-bi%E1%BB%83u-th%E1%BB%A9c Mon, 26 Feb 2024 12:05:52 +0000 Một xe máy và một ô tô cùng khởi hành ... https://selfomy.com/hoidap/474287/m%E1%BB%99t-xe-m%C3%A1y-v%C3%A0-m%E1%BB%99t-%C3%B4-t%C3%B4-c%C3%B9ng-kh%E1%BB%9Fi-h%C3%A0nh Toán lớp 9 https://selfomy.com/hoidap/474287/m%E1%BB%99t-xe-m%C3%A1y-v%C3%A0-m%E1%BB%99t-%C3%B4-t%C3%B4-c%C3%B9ng-kh%E1%BB%9Fi-h%C3%A0nh Mon, 26 Feb 2024 12:05:47 +0000 Giải phương trình: (x^2 + 2x + 3)(x^2 - 6x + 3) = -7x^2 https://selfomy.com/hoidap/474288/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-2x-3-x-2-6x-3-7x-2 Toán lớp 9 https://selfomy.com/hoidap/474288/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-2x-3-x-2-6x-3-7x-2 Mon, 26 Feb 2024 12:05:45 +0000 Giải phương trình: x^2 + 5x + 9 = (x+5)√x^2+9 https://selfomy.com/hoidap/474290/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-5x-9-x-5-%E2%88%9Ax-2-9 Toán lớp 9 https://selfomy.com/hoidap/474290/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-5x-9-x-5-%E2%88%9Ax-2-9 Mon, 26 Feb 2024 12:05:44 +0000 Cho tam giác ABC vuông tại A, đường cao AH ... https://selfomy.com/hoidap/474289/cho-tam-gi%C3%A1c-abc-vu%C3%B4ng-t%E1%BA%A1i-a-%C4%91%C6%B0%E1%BB%9Dng-cao-ah Toán lớp 9 https://selfomy.com/hoidap/474289/cho-tam-gi%C3%A1c-abc-vu%C3%B4ng-t%E1%BA%A1i-a-%C4%91%C6%B0%E1%BB%9Dng-cao-ah Mon, 26 Feb 2024 12:05:43 +0000 Giải phương trình: x^2 - 7x = 6√x+5 - 30 https://selfomy.com/hoidap/474291/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-7x-6%E2%88%9Ax-5-30 Toán lớp 9 https://selfomy.com/hoidap/474291/gi%E1%BA%A3i-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-7x-6%E2%88%9Ax-5-30 Mon, 26 Feb 2024 12:04:25 +0000 Cho hàm số y = 2x + 3m -1 với m là tham số. Tìm giá trị của tham số m để đồ thị hàm số đi qua B(1;4) https://selfomy.com/hoidap/474277/cho-h%C3%A0m-s%E1%BB%91-2x-v%E1%BB%9Bi-l%C3%A0-tham-s%E1%BB%91-t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-c%E1%BB%A7a-tham-th%E1%BB%8B-h%C3%A0m-s%E1%BB%91-%C4%91i-qua Toán lớp 9 https://selfomy.com/hoidap/474277/cho-h%C3%A0m-s%E1%BB%91-2x-v%E1%BB%9Bi-l%C3%A0-tham-s%E1%BB%91-t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-c%E1%BB%A7a-tham-th%E1%BB%8B-h%C3%A0m-s%E1%BB%91-%C4%91i-qua Sun, 25 Feb 2024 22:52:54 +0000 Cho parabol y = x^2 có đồ thị (P) và đường thẳng (d): y = 2x + m -2 ... https://selfomy.com/hoidap/474278/cho-parabol-y-x-2-c%C3%B3-%C4%91%E1%BB%93-th%E1%BB%8B-p-v%C3%A0-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-d-y-2x-m-2 Toán lớp 9 https://selfomy.com/hoidap/474278/cho-parabol-y-x-2-c%C3%B3-%C4%91%E1%BB%93-th%E1%BB%8B-p-v%C3%A0-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-d-y-2x-m-2 Sun, 25 Feb 2024 22:52:53 +0000 Cho ba số dương a, b, c thỏa mãn a + b + c = 12. Chứng minh rằng https://selfomy.com/hoidap/474279/cho-ba-s%E1%BB%91-d%C6%B0%C6%A1ng-a-b-c-th%E1%BB%8Fa-m%C3%A3n-a-b-c-12-ch%E1%BB%A9ng-minh-r%E1%BA%B1ng Toán lớp 9 https://selfomy.com/hoidap/474279/cho-ba-s%E1%BB%91-d%C6%B0%C6%A1ng-a-b-c-th%E1%BB%8Fa-m%C3%A3n-a-b-c-12-ch%E1%BB%A9ng-minh-r%E1%BA%B1ng Sun, 25 Feb 2024 22:52:51 +0000 Xác định các hệ số a, b để đường thẳng y = ax + b đi qua hai điểm A(-5;3) và B(4;2) https://selfomy.com/hoidap/474267/x%C3%A1c-%C4%91%E1%BB%8Bnh-c%C3%A1c-h%E1%BB%87-s%E1%BB%91-b-%C4%91%E1%BB%83-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-y-ax-b-%C4%91i-qua-hai-%C4%91i%E1%BB%83m-a-5-3-v%C3%A0-b-4 Toán lớp 9 https://selfomy.com/hoidap/474267/x%C3%A1c-%C4%91%E1%BB%8Bnh-c%C3%A1c-h%E1%BB%87-s%E1%BB%91-b-%C4%91%E1%BB%83-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-y-ax-b-%C4%91i-qua-hai-%C4%91i%E1%BB%83m-a-5-3-v%C3%A0-b-4 Sun, 25 Feb 2024 12:26:37 +0000 Cho hai hàm số y = -4x^2 https://selfomy.com/hoidap/474268/cho-hai-h%C3%A0m-s%E1%BB%91-y-4x-2 Toán lớp 9 https://selfomy.com/hoidap/474268/cho-hai-h%C3%A0m-s%E1%BB%91-y-4x-2 Sun, 25 Feb 2024 12:26:36 +0000 Giải các phương trình sau https://selfomy.com/hoidap/474269/gi%E1%BA%A3i-c%C3%A1c-ph%C6%B0%C6%A1ng-tr%C3%ACnh-sau Toán lớp 9 https://selfomy.com/hoidap/474269/gi%E1%BA%A3i-c%C3%A1c-ph%C6%B0%C6%A1ng-tr%C3%ACnh-sau Sun, 25 Feb 2024 12:26:33 +0000 Một chiếc cổng hình parabol có phương trình y = -1/2 x^2 biết rằng có chiều rộng 4 mét. Hãy tính chiều cao của cổng https://selfomy.com/hoidap/474270/chi%E1%BA%BFc-parabol-ph%C6%B0%C6%A1ng-tr%C3%ACnh-bi%E1%BA%BFt-r%E1%BA%B1ng-chi%E1%BB%81u-r%E1%BB%99ng-t%C3%ADnh-chi%E1%BB%81u-c%E1%BB%95ng Toán lớp 9 https://selfomy.com/hoidap/474270/chi%E1%BA%BFc-parabol-ph%C6%B0%C6%A1ng-tr%C3%ACnh-bi%E1%BA%BFt-r%E1%BA%B1ng-chi%E1%BB%81u-r%E1%BB%99ng-t%C3%ADnh-chi%E1%BB%81u-c%E1%BB%95ng Sun, 25 Feb 2024 12:26:31 +0000 Cho phương trình: x^2 + 2(m-1)x - m = 0 https://selfomy.com/hoidap/474271/cho-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-2-m-1-x-m-0 Toán lớp 9 https://selfomy.com/hoidap/474271/cho-ph%C6%B0%C6%A1ng-tr%C3%ACnh-x-2-2-m-1-x-m-0 Sun, 25 Feb 2024 12:26:29 +0000 Giải bài toán sau https://selfomy.com/hoidap/474272/gi%E1%BA%A3i-b%C3%A0i-to%C3%A1n-sau Toán lớp 9 https://selfomy.com/hoidap/474272/gi%E1%BA%A3i-b%C3%A0i-to%C3%A1n-sau Sun, 25 Feb 2024 12:26:28 +0000 Rút gọn biểu thức sau https://selfomy.com/hoidap/474236/r%C3%BAt-g%E1%BB%8Dn-bi%E1%BB%83u-th%E1%BB%A9c-sau Toán lớp 9 https://selfomy.com/hoidap/474236/r%C3%BAt-g%E1%BB%8Dn-bi%E1%BB%83u-th%E1%BB%A9c-sau Wed, 21 Feb 2024 22:36:16 +0000 Nêu tính chất của hai tiếp tuyến cắt nhau https://selfomy.com/hoidap/474033/n%C3%AAu-t%C3%ADnh-ch%E1%BA%A5t-c%E1%BB%A7a-hai-ti%E1%BA%BFp-tuy%E1%BA%BFn-c%E1%BA%AFt-nhau Toán lớp 9 https://selfomy.com/hoidap/474033/n%C3%AAu-t%C3%ADnh-ch%E1%BA%A5t-c%E1%BB%A7a-hai-ti%E1%BA%BFp-tuy%E1%BA%BFn-c%E1%BA%AFt-nhau Fri, 26 Jan 2024 22:41:21 +0000 ìm giá trị nhỏ nhất mà A có thể đạt được. https://selfomy.com/hoidap/473989/%C3%ACm-gi%C3%A1-tr%E1%BB%8B-nh%E1%BB%8F-nh%E1%BA%A5t-m%C3%A0-a-c%C3%B3-th%E1%BB%83-%C4%91%E1%BA%A1t-%C4%91%C6%B0%E1%BB%A3c Toán lớp 9 https://selfomy.com/hoidap/473989/%C3%ACm-gi%C3%A1-tr%E1%BB%8B-nh%E1%BB%8F-nh%E1%BA%A5t-m%C3%A0-a-c%C3%B3-th%E1%BB%83-%C4%91%E1%BA%A1t-%C4%91%C6%B0%E1%BB%A3c Thu, 25 Jan 2024 13:02:34 +0000 Cho hai đường tròn (O) và (O’) ở ngoài nhau. https://selfomy.com/hoidap/473988/cho-hai-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-o-v%C3%A0-o-%E1%BB%9F-ngo%C3%A0i-nhau Toán lớp 9 https://selfomy.com/hoidap/473988/cho-hai-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-o-v%C3%A0-o-%E1%BB%9F-ngo%C3%A0i-nhau Thu, 25 Jan 2024 13:02:32 +0000 Trong cùng một hệ trục toạ độ vuông góc, cho parapol https://selfomy.com/hoidap/473987/trong-c%C3%B9ng-m%E1%BB%99t-h%E1%BB%87-tr%E1%BB%A5c-to%E1%BA%A1-%C4%91%E1%BB%99-vu%C3%B4ng-g%C3%B3c-cho-parapol Toán lớp 9 https://selfomy.com/hoidap/473987/trong-c%C3%B9ng-m%E1%BB%99t-h%E1%BB%87-tr%E1%BB%A5c-to%E1%BA%A1-%C4%91%E1%BB%99-vu%C3%B4ng-g%C3%B3c-cho-parapol Thu, 25 Jan 2024 13:02:31 +0000 Chứng minh: nếu a, b là các nghiệm của phương trình:  https://selfomy.com/hoidap/473986/ch%E1%BB%A9ng-minh-n%E1%BA%BFu-a-b-l%C3%A0-c%C3%A1c-nghi%E1%BB%87m-c%E1%BB%A7a-ph%C6%B0%C6%A1ng-tr%C3%ACnh-%C2%A0 Toán lớp 9 https://selfomy.com/hoidap/473986/ch%E1%BB%A9ng-minh-n%E1%BA%BFu-a-b-l%C3%A0-c%C3%A1c-nghi%E1%BB%87m-c%E1%BB%A7a-ph%C6%B0%C6%A1ng-tr%C3%ACnh-%C2%A0 Thu, 25 Jan 2024 13:02:30 +0000  Trên mặt phẳng toạ độ cho đường thẳng (d) có phương trình: 2kx + (k – 1)y = 2 (k là tham số) https://selfomy.com/hoidap/473985/%C2%A0tr%C3%AAn-m%E1%BA%B7t-ph%E1%BA%B3ng-to%E1%BA%A1-%C4%91%E1%BB%99-cho-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-c%C3%B3-ph%C6%B0%C6%A1ng-tr%C3%ACnh-2kx-tham Toán lớp 9 https://selfomy.com/hoidap/473985/%C2%A0tr%C3%AAn-m%E1%BA%B7t-ph%E1%BA%B3ng-to%E1%BA%A1-%C4%91%E1%BB%99-cho-%C4%91%C6%B0%E1%BB%9Dng-th%E1%BA%B3ng-c%C3%B3-ph%C6%B0%C6%A1ng-tr%C3%ACnh-2kx-tham Thu, 25 Jan 2024 13:02:29 +0000 Chứng minh rằng: góc AOB = BOC = COA = 90độ https://selfomy.com/hoidap/473984/ch%E1%BB%A9ng-minh-r%E1%BA%B1ng-g%C3%B3c-aob-boc-coa-90%C4%91%E1%BB%99 Toán lớp 9 https://selfomy.com/hoidap/473984/ch%E1%BB%A9ng-minh-r%E1%BA%B1ng-g%C3%B3c-aob-boc-coa-90%C4%91%E1%BB%99 Thu, 25 Jan 2024 13:02:28 +0000 Giải bài toán bằng cách lập phương trình. https://selfomy.com/hoidap/473983/gi%E1%BA%A3i-b%C3%A0i-to%C3%A1n-b%E1%BA%B1ng-c%C3%A1ch-l%E1%BA%ADp-ph%C6%B0%C6%A1ng-tr%C3%ACnh Toán lớp 9 https://selfomy.com/hoidap/473983/gi%E1%BA%A3i-b%C3%A0i-to%C3%A1n-b%E1%BA%B1ng-c%C3%A1ch-l%E1%BA%ADp-ph%C6%B0%C6%A1ng-tr%C3%ACnh Thu, 25 Jan 2024 13:02:27 +0000 Cho biểu thức: https://selfomy.com/hoidap/473982/cho-bi%E1%BB%83u-th%E1%BB%A9c Toán lớp 9 https://selfomy.com/hoidap/473982/cho-bi%E1%BB%83u-th%E1%BB%A9c Thu, 25 Jan 2024 13:02:26 +0000 Cho tam giác ABC nội tiếp đường tròn (O) và điểm D bất kì trên cạnh AB https://selfomy.com/hoidap/473979/cho-tam-gi%C3%A1c-abc-n%E1%BB%99i-ti%E1%BA%BFp-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-v%C3%A0-%C4%91i%E1%BB%83m-b%E1%BA%A5t-k%C3%AC-tr%C3%AAn-c%E1%BA%A1nh-ab Toán lớp 9 https://selfomy.com/hoidap/473979/cho-tam-gi%C3%A1c-abc-n%E1%BB%99i-ti%E1%BA%BFp-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-v%C3%A0-%C4%91i%E1%BB%83m-b%E1%BA%A5t-k%C3%AC-tr%C3%AAn-c%E1%BA%A1nh-ab Thu, 25 Jan 2024 12:38:44 +0000 Tính bán kính đường tròn. https://selfomy.com/hoidap/473980/t%C3%ADnh-b%C3%A1n-k%C3%ADnh-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n Toán lớp 9 https://selfomy.com/hoidap/473980/t%C3%ADnh-b%C3%A1n-k%C3%ADnh-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n Thu, 25 Jan 2024 12:38:42 +0000 Lũy thừ bậc 4 của https://selfomy.com/hoidap/473810/l%C5%A9y-th%E1%BB%AB-b%E1%BA%ADc-4-c%E1%BB%A7a Toán lớp 9 https://selfomy.com/hoidap/473810/l%C5%A9y-th%E1%BB%AB-b%E1%BA%ADc-4-c%E1%BB%A7a Sun, 31 Dec 2023 16:46:50 +0000 tâm đường tròn ngoại tiếp tam giác là giao điểm của https://selfomy.com/hoidap/473811/t%C3%A2m-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-ngo%E1%BA%A1i-ti%E1%BA%BFp-tam-gi%C3%A1c-l%C3%A0-giao-%C4%91i%E1%BB%83m-c%E1%BB%A7a Toán lớp 9 https://selfomy.com/hoidap/473811/t%C3%A2m-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-ngo%E1%BA%A1i-ti%E1%BA%BFp-tam-gi%C3%A1c-l%C3%A0-giao-%C4%91i%E1%BB%83m-c%E1%BB%A7a Sun, 31 Dec 2023 16:46:49 +0000 đường tròn bàng tiếp là https://selfomy.com/hoidap/473812/%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-b%C3%A0ng-ti%E1%BA%BFp-l%C3%A0 Toán lớp 9 https://selfomy.com/hoidap/473812/%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n-b%C3%A0ng-ti%E1%BA%BFp-l%C3%A0 Sun, 31 Dec 2023 16:46:47 +0000 nêu kiến thức về tính chất 2 tiếp tuyết cắt nhau https://selfomy.com/hoidap/473813/n%C3%AAu-ki%E1%BA%BFn-th%E1%BB%A9c-v%E1%BB%81-t%C3%ADnh-ch%E1%BA%A5t-2-ti%E1%BA%BFp-tuy%E1%BA%BFt-c%E1%BA%AFt-nhau Toán lớp 9 https://selfomy.com/hoidap/473813/n%C3%AAu-ki%E1%BA%BFn-th%E1%BB%A9c-v%E1%BB%81-t%C3%ADnh-ch%E1%BA%A5t-2-ti%E1%BA%BFp-tuy%E1%BA%BFt-c%E1%BA%AFt-nhau Sun, 31 Dec 2023 16:46:46 +0000 nêu lý thuyết về vị chí tương đối của 2 đường tròn https://selfomy.com/hoidap/473814/n%C3%AAu-l%C3%BD-thuy%E1%BA%BFt-v%E1%BB%81-v%E1%BB%8B-ch%C3%AD-t%C6%B0%C6%A1ng-%C4%91%E1%BB%91i-c%E1%BB%A7a-2-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n Toán lớp 9 https://selfomy.com/hoidap/473814/n%C3%AAu-l%C3%BD-thuy%E1%BA%BFt-v%E1%BB%81-v%E1%BB%8B-ch%C3%AD-t%C6%B0%C6%A1ng-%C4%91%E1%BB%91i-c%E1%BB%A7a-2-%C4%91%C6%B0%E1%BB%9Dng-tr%C3%B2n Sun, 31 Dec 2023 16:46:41 +0000 chứng minh... https://selfomy.com/hoidap/473380/ch%E1%BB%A9ng-minh Toán lớp 9 https://selfomy.com/hoidap/473380/ch%E1%BB%A9ng-minh Tue, 28 Nov 2023 16:59:37 +0000 Tìm giá trị nhỏ nhất đó. https://selfomy.com/hoidap/473381/t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-nh%E1%BB%8F-nh%E1%BA%A5t-%C4%91%C3%B3 Toán lớp 9 https://selfomy.com/hoidap/473381/t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-nh%E1%BB%8F-nh%E1%BA%A5t-%C4%91%C3%B3 Tue, 28 Nov 2023 16:59:36 +0000 Hãy so sánh S .. https://selfomy.com/hoidap/473382/h%C3%A3y-so-s%C3%A1nh-s Toán lớp 9 https://selfomy.com/hoidap/473382/h%C3%A3y-so-s%C3%A1nh-s Tue, 28 Nov 2023 16:59:35 +0000 Chứng minh rằng: https://selfomy.com/hoidap/473383/ch%E1%BB%A9ng-minh-r%E1%BA%B1ng Toán lớp 9 https://selfomy.com/hoidap/473383/ch%E1%BB%A9ng-minh-r%E1%BA%B1ng Tue, 28 Nov 2023 16:59:34 +0000 bài tập toán https://selfomy.com/hoidap/473385/b%C3%A0i-t%E1%BA%ADp-to%C3%A1n Toán lớp 9 https://selfomy.com/hoidap/473385/b%C3%A0i-t%E1%BA%ADp-to%C3%A1n Tue, 28 Nov 2023 16:59:33 +0000 Chứng minh rằng các số sau là số vô tỉ: https://selfomy.com/hoidap/473384/ch%E1%BB%A9ng-minh-r%E1%BA%B1ng-c%C3%A1c-s%E1%BB%91-sau-l%C3%A0-s%E1%BB%91-v%C3%B4-t%E1%BB%89 Toán lớp 9 https://selfomy.com/hoidap/473384/ch%E1%BB%A9ng-minh-r%E1%BA%B1ng-c%C3%A1c-s%E1%BB%91-sau-l%C3%A0-s%E1%BB%91-v%C3%B4-t%E1%BB%89 Tue, 28 Nov 2023 16:59:32 +0000  Tìm giá trị lớn nhất của biểu thức: https://selfomy.com/hoidap/473329/%C2%A0t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-l%E1%BB%9Bn-nh%E1%BA%A5t-c%E1%BB%A7a-bi%E1%BB%83u-th%E1%BB%A9c Toán lớp 9 https://selfomy.com/hoidap/473329/%C2%A0t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-l%E1%BB%9Bn-nh%E1%BA%A5t-c%E1%BB%A7a-bi%E1%BB%83u-th%E1%BB%A9c Sun, 26 Nov 2023 23:25:27 +0000  So sánh các số thực sau (không dùng máy tính): https://selfomy.com/hoidap/473328/%C2%A0so-s%C3%A1nh-c%C3%A1c-s%E1%BB%91-th%E1%BB%B1c-sau-kh%C3%B4ng-d%C3%B9ng-m%C3%A1y-t%C3%ADnh Toán lớp 9 https://selfomy.com/hoidap/473328/%C2%A0so-s%C3%A1nh-c%C3%A1c-s%E1%BB%91-th%E1%BB%B1c-sau-kh%C3%B4ng-d%C3%B9ng-m%C3%A1y-t%C3%ADnh Sun, 26 Nov 2023 23:25:24 +0000 Tìm giá trị lớn nhất của biểu thức A = x2y với các điều kiện x, y > 0 và 2x + xy = 4. https://selfomy.com/hoidap/473327/t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-l%E1%BB%9Bn-nh%E1%BA%A5t-c%E1%BB%A7a-bi%E1%BB%83u-th%E1%BB%A9c-x2y-v%E1%BB%9Bi-c%C3%A1c-%C4%91i%E1%BB%81u-ki%E1%BB%87n-v%C3%A0-2x-xy Toán lớp 9 https://selfomy.com/hoidap/473327/t%C3%ACm-gi%C3%A1-tr%E1%BB%8B-l%E1%BB%9Bn-nh%E1%BA%A5t-c%E1%BB%A7a-bi%E1%BB%83u-th%E1%BB%A9c-x2y-v%E1%BB%9Bi-c%C3%A1c-%C4%91i%E1%BB%81u-ki%E1%BB%87n-v%C3%A0-2x-xy Sun, 26 Nov 2023 23:25:23 +0000 Hãy viết ... https://selfomy.com/hoidap/473326/h%C3%A3y-vi%E1%BA%BFt Toán lớp 9 https://selfomy.com/hoidap/473326/h%C3%A3y-vi%E1%BA%BFt Sun, 26 Nov 2023 23:25:21 +0000 chứng minh ... https://selfomy.com/hoidap/473325/ch%E1%BB%A9ng-minh Toán lớp 9 https://selfomy.com/hoidap/473325/ch%E1%BB%A9ng-minh Sun, 26 Nov 2023 23:25:04 +0000