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nguyenthanhthao
2 năm trước
Chứng minh rằng với mọi x, y, z ta có: a) $x^{2}$ + 2$y^{2}$ + $z^{2}$ ≥ y(x+z) b) $x^{2}$ + 2$y^{2}$ + 3$z^{2}$ ≥ 2y(x+2z) Hứa vote 5 sao và cám ơn nếu giải đúng và đủ
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