求F(X.Y)=X*X*X+8Y*Y*Y-6XY+5的极值
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求F(X.Y)=X*X*X+8Y*Y*Y-6XY+5的极值
求F(X.Y)=X*X*X+8Y*Y*Y-6XY+5的极值
求F(X.Y)=X*X*X+8Y*Y*Y-6XY+5的极值
没有极小值.
比如;x,y均为负无穷大时,F(X.Y)为负无穷大
也没有极大值.
比如;x=-y,且y为正无穷大时,F(X.Y)为正无穷大.
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求F(X.Y)=X*X*X+8Y*Y*Y-6XY+5的极值
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