b+ab分之ab-b化简
问题描述：
b+ab分之ab-b化简
答
(ab-b)/(b+ab)
=b(a-1)/b(a+1)
=(a-1)/(a+1)
b+ab分之ab-b化简
(ab-b)/(b+ab)
=b(a-1)/b(a+1)
=(a-1)/(a+1)