函数f(x,y)=x4-3x2y2+z-2在点(1,1)处的二阶泰勒多项式是 ( )

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问题 函数f(x,y)=x4-3x2y2+z-2在点(1,1)处的二阶泰勒多项式是    (    )

选项 A、-3+(4x3-6xy2+1)x-6x2.y.y+[(12x2-6y2)x2-24xy.xy-6x2.y2]
B、-3+(4x2-6x2y+1)(x-1)-6x2y(y-1)+[(12x2-6y2)(x-1)2-24xy(x-1)(y-1)-6x2(y-1)2]
C、-3-(x-1)-6(y-1)+[6(x-1)2-24(x-1)(y-1)-6(y-1)2]
D、-3-x-6y+(6x2-24xy-6y2)

答案C

解析 直接套用二元函数的泰勒公式即知(C)正确.
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