计算a-1分之a+1乘以a+1分之a的平方-1-1
问题描述:
计算a-1分之a+1乘以a+1分之a的平方-1-1
答
原式=(a+1)/(a-1)*【(a+1)(a-1)/(a+1)】-1
=a+1-1=a