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thanhvan080900
2 năm trước
BÀI TẬP 1: Cho A=3 (a^2 +1/a^2) xyz (5/3xy^3z^5) a, chứng minh rằng A ≥với mọi x,y,z b, Với giá trị nào của x,y,z thì A=0 BÀI TẬP 2: cho các đơn thức A= -4/9 x^3 yz^5 B=19/4 x^5y^3.z Có các giá trị nào của x,y,z làm A và B?
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