化简(b+ab)分之(a方-1)
问题描述：
化简(b+ab)分之(a方-1)
答
a²-1=(a+1)(a-1),b+ab=b(a+1),分子分母同除a+1
答
(a^2-1)/(b+ab)
=(a+1)(a-1)/(b+ab)
=(a+1)(a-1)]/[b(1+a)]
=(a-1)/b
=(a/b)-(1/b)