Cho x,y,z thay đổi và thỏa mãn x2+y2+z2=1 Tìm giá trị lớn nhất và bé nhất của biểu thức:
P=x+y+z+xy+yz+zx

bị xóa vì bị trùng bởi Confusion 16-06-16 08:22 PM

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

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