问题 解答题
化简:(1)
2b2
a+b
-b+a

(2)
2x+1
4x-1
-
x+1
1-4x
+
5x-4
4x-1
答案

(1)原式=

2b2
a+b
-
b(a+b)
a+b
+
a(a+b)
a+b
=
2b2-ab-b2+a2+ab
a+b
=
a2+b2
a+b

(2)原式=

2x+1
4x-1
+
x+1
4x-1
+
5x-4
4x-1
=
8x-2
4x-1
=2.

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