求二元函数f(x,y)=x²+y²+2y的极值
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求二元函数f(x,y)=x²+y²+2y的极值
求二元函数f(x,y)=x²+y²+2y的极值
求二元函数f(x,y)=x²+y²+2y的极值
f'x=2x=0
f'y=2y+2=0
得:x=0,y=-1
A=f"xx=2,B=f"xy=0,C=f"yy=2
A>0,B^2-AC