計算化簡：
6y
x2-y2
-
2
y-x
+
3
x+y
=______．
原式=
6y
(x+y)(x-y)
+
2
x-y
+
3
x+y

=
6y
(x+y)(x-y)
+
2(x+y)
(x+y)(x-y)
+
3(x-y)
(x+y)(x-y)

=
6y+2x+2y+3x-3y
(x+y)(x-y)

=
6y
(x+y)(x-y)
+
2(x+y)
(x+y)(x-y)
+
3(x-y)
(x+y)(x-y)

=
5(x+y)
(x+y)(x-y)

=
5
x-y
．
故答案為
5
x-y
．
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計算化簡：
6y
x2-y2
-
2
y-x
+
3
x+y
=
5
x-y
．
5
x-y
．
．

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