问题 解答题
计算
(1)(x+y)•
x2
x2-y2
+
y 2
y-x

(2)(
x+2
x-2
+
4
x2-4x+4
x
x-2
答案

(1)原式=

x2
x-y
-
y2
x-y
=
(x+y)(x-y)
x-y
=x+y;

(2)原式=

x2-4+4
(x-2)2
x-2
x
=
x2
(x-2)2
x-2
x
=
x
x-2

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