计算:(1)a-b+2b2a+b(2)xyx2-y2÷(1x-y-1x+y).-数学

题目简介

计算:(1)a-b+2b2a+b(2)xyx2-y2÷(1x-y-1x+y).-数学

题目详情

计算:
(1)a-b+
2b2
a+b

(2)
xy
x2-y2
÷(
1
x-y
-
1
x+y
)
题型:解答题难度:中档来源:不详

答案

(1)原式=
(a-b)(a+b)+2b2
a+b

=
a2+b2
a+b


(2)原式=class="stub"xy
(x+y)(x-y)
÷class="stub"x+y-x+y
(x+y)(x-y)

=class="stub"xy
(x+y)(x-y)
(x+y)(x-y)
2y

=class="stub"x
2

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