设z=ln(1-x+y)+x2y,求∂2z/∂y∂x.
设z=ln(1-x+y)+x2y,求∂2z/∂y∂x.
【正确答案】:∂z/∂y=1/(1-x+y)+x2,∂2z/∂y∂x=1/(1-x+y)2+2x.
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