Cho : x, y, z là các số thực ko âm. CMR : 
$3(x^2+y^2+z^2)\geq (x+y+z)(\sqrt{xy}+\sqrt{yz}+\sqrt{zx})+(x-y)^2+(y-z)^2+(z-x)^2\geq (x+y+z)^2$
hihi em ko bít gõ dấu căn –  ๖ۣۜBossღ 02-05-16 08:22 PM
nhân tung hết là ra @@ –  tran85295 02-05-16 08:12 PM
ậy bài này treo 5k cơ à :3 –  tran85295 02-05-16 08:12 PM
vấn đề đầu tiên là chỉnh lại cái đề –  Confusion 02-05-16 08:03 PM

Câu hỏi này được treo giải thưởng trị giá +5000 vỏ sò bởi ๖ۣۜBossღ, đã hết hạn vào lúc 07-05-16 07:52 PM

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