计算a-b+2b2a+b等于_.
问题描述:
计算a-b+
等于______. 2b2
a+b
答
a-b+
=2b2
a+b
+(a−b)(a+b) a+b
,2b2
a+b
=
,
a2−b2+2b2
a+b
=
,
a2+b2
a+b
故答案为:
.
a2+b2
a+b