Cho 3 số dương $x, y, z$ thỏa mãn: $x+3y+5y\leq 3.$ Chứng minh rằng:
$3xy\sqrt{625z^4+4}+15yz\sqrt{x^4+4}+5zx\sqrt{81y^4+4}\geq 45\sqrt{5}xyz.$

bị xóa vì bị trùng bởi Confusion 04-07-16 06:14 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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