题目内容：

y=x-1/x+1的导数
y=2x5-3x2+5x-4的导数
y=[2x2+3][3x-2]的导数

优质解答

1.y’=（x-1）’/(X+1)+(x-1)×[1/(x+1)]'=1/(x+1)+(x-1)×[-1/(x+1)²×(x+1)']=1/(x+1)+(x-1)×[-1/(x+1)²]=(x+1)/(x+1)²-（x-1）/(x+1)²=2/（x+1）²2.y'=2×(x5)'-3(x²)'+(5x)'=2×...