设z=ex2+2y,求∂2z/∂x∂y.
设z=ex2+2y,求∂2z/∂x∂y.
【正确答案】:∂z/∂x=ex2+2y•2x,∂2z/∂x∂y=∂/∂y(ex2+2y•2x)=ex2+2y•2(2x)=4xex2+2y
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