设函数f(x,y)=(1+xy)y,求fy(1,1).
lnf=yln(1+xy) ∴∂lnf/∂y=ln(1+xy)+xy/(1+xy)=1/f•∂f/∂y ∴∂f/∂y=(1+xy)y[ln(1+xy)+xy/(1+xy)] ∴fy(1,1)=2(1n2+1/2)=1+2ln2
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