问题 解答题
计算:
(1)(
1
2
-2-
2
3
×
9
8
+80+(-1)2011+(
4
3
-1            
(2)(-3x-3-2÷x4
(3)
1
x2-4x+4
-
x
x2-4
+
1
2x+4
                  
(4)
1
a+1
+
a2-a
a2-2a-3
÷
a
a-3
答案

(1)原式=4-

3
4
+1-1+
3
4
=4;

(2)原式=

1
9
x6÷x4=
1
9
x2

(3)原式=

-x2+2x+8
2(x+2)(x-2)2
=-
x-6
2(x-2)2

(4)原式=

1
a+1
+
a-1
a+1
=
a
a+1

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