求导法则：(f(x)*g(x))=f'(x)*g(x)+g'(x)*f(x),设g(x)=e^x, h(x)=(x+b)*(x-2)^2,f'(x)=(g(x)h(x))'=g'(x)h(x)+h'(x)g(x)因为g'(x)=g(x)=e^x,则f'(x)=e^x*(x+b)*(x-2)^2+e^x*[(x+b)*(x-2)^2]'
