导数[(1
[(1-x)/(1+x)]×e^x求导
设：y=[(1-x)/(1+x)]×e^x y'=[(1-x)/(1+x)]'×e^x+[(1-x)/(1+x)]×(e^x)' ={[-(1+x)-(1-x)]/(1+x)²}×e^x+[(1-x)/(1+x)]×e^x =[-2/(1+x)²+（1-x)/(1+x)]×e^x =-(1+x²）e^x/(1+x)²