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由題知, z=f(xy,y) 所以, dz/dx=f1(xy,y)*y 而 d²;z/dxdy =d(dz/dx)/dy =d(f1(xy,y)*y)/dy =f1(xy,y)+y[f11(xy,y)*x+f12(xy,y)] =f1+xy*f11+y*f12 其中,f(u,v)對u求導記做f1,對y求導記做f2
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