a²-1分之4乘6a分之a-1
问题描述:
a²-1分之4乘6a分之a-1
答
=4/(a²-1)*(a-1)/6a
=4/(a+1)(a-1)*(a-1)/6a
=(4*1)/(a+1)*6a
=2/(3a²+3a)