约分a+b/a^3-ab^2
问题描述:
约分a+b/a^3-ab^2
如图
答
(a+b)/(a^3 - a(b^2))
= (a+b)/(a)(a^2 - b^2)
= (a+b)/(a)(a+b)(a-b)
= 1/a^2-ab