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nninh569
2 năm trước
1) Với ba số dường x, y, z thỏa mãn x + y + z = 1, chứng minh 1−x^2/x+yz + 1−y^2/y+zx + 1−z2/z+xy ≥ 6 2) Cho các số thực a, b, c thỏa mãn điều kiện a ≥ 3, ab ≥ 6, abc ≥ 6. Chứng minh rằng: a^2+b^2+c^2≥14 Ai nhanh và đúng thì mình sẽ tick và add friends nhé. Thanks. Please help me!!! PLEASE!!!
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