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Member Since 01-05-2019
Offline Last Active 02-05-2019 - 23:19

01-05-2019 - 21:46

Giúp em bài này với huhu

cho các số thực x ,y , z thỏa mãn

x²+y²+z²=200

Tìm GTNN M= 2xy -yz -xz

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