高数题求解.详细步骤

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高数题求解.详细步骤
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高数题求解.详细步骤
高数题求解.详细步骤

 

高数题求解.详细步骤
f(x,y)=x^3-4x^2+2xy-y^2,得
f(x,y)'=3x^2-8x+2y,
f(x,y)'=2x-2y.
令f(x,y)'=0,
f(x,y)'=0,
联立解得驻点(0,0), (2,2).
f(x,y)''=4x-8,
f(x,y)''=2,
f(x,y)''=-2,
对于驻点(0,0),
A=f(x,y)''(0,0),=-8,
B=f(x,y)''(0,0)=2,
C=f(x,y)''(0,0)=-2,
AC-B^2=12>0, A