数学
(2004·郑州)计算
(
a+1
a
2
-a
+
4
1-
a
2
)÷
a
2
+2a-3
a+3
(2004·泰州)化简:
(
a
a-1
-
2
a
2
-1
)÷(1-
1
a+1
)
.
(2004·泰安)化简:
(
a-1
a
2
-4a+4
-
a+2
a
2
-2a
)÷(
4
a
-1)
.
(244它·苏州)化简:(
x+2
x-2
+
它
x
2
-它x+它
)÷
x
x-2
.
(2004·淮安)化简:
a-1
a+2
·
a
2
+4a+4
a-1
-2
.
(2003·南京)计算:
a
2
-ab
a
2
÷(
a
b
-
b
a
)
(2003·成都)化简:
2x-6
x
2
-9
+
x
2
+2x+1
x
2
+x-6
÷
x+1
x-2
(2002·徐州)计算:
(ab-
b
2
)·
a
a
2
-
b
2
-a
(2001·苏州)化简:
(a-
a
a+1
)÷
a
2
-2a
a
2
-4
·
a+1
a
2
3a+2
.
(2000·宁波)化简:
(xy-
x
2
)(
1
x
+
1
y-x
)
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