计算a-b+2b2a+b等于_.

问题描述:

计算a-b+

2b2
a+b
等于______.

a-b+

2b2
a+b
=
(a−b)(a+b)
a+b
+
2b2
a+b

=
a2b2+2b2
a+b

=
a2+b2
a+b

故答案为:
a2+b2
a+b