Cho x , y , z là các số thực không âm và : √1+x2+√1+2y+√1+2z=5

Tìm GTLN của biểu thức : P=2x3+y3+z3

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 01:23 PM

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

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