f(x,y)=2xy-3x^2-2Y^2+10的极值为
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f(x,y)=2xy-3x^2-2Y^2+10的极值为f(x,y)=2xy-3x^2-2Y^2+10的极值为f(x,y)=2xy-3x^2-2Y^2+10的极值为f(x,y)=2xy-3x^2-2y^
f(x,y)=2xy-3x^2-2Y^2+10的极值为
f(x,y)=2xy-3x^2-2Y^2+10的极值为
f(x,y)=2xy-3x^2-2Y^2+10的极值为
f(x,y)=2xy-3x^2-2y^2+10
= -(x-y)^2 - 2x^2 - y^2 + 10,
其中：
∵ (x-y)^2 ≥ 0,-2x^2 ≥ 0,-y^2 ≥ 0
∴ -(x-y)^2 ≤ 0,-2x^2 ≤ 0,-y^2 ≤ 0
∴-(x-y)^2-2x^2-y^2+10 ≤ 10
∴Z的最大值为10
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