计算(1)(-a32b)2÷(-a2b)3•(b2)2(2)2x+4x2-6x+9÷(x+2)•x2-9x+2÷2x+2(3)x+2x2-2x-x-1x2-4x

计算(1)(-a32b)2÷(-a2b)3•(b2)2(2)2x+4x2-6x+9÷(x+2)•x2-9x+2÷2x+2(3)x+2x2-2x-x-1x2-4x

题型:解答题难度:一般来源:不详
计算
(1)(-
a3
2b
)2÷(-
a2
b
)3•(
b
2
)2

(2)
2x+4
x2-6x+9
÷(x+2)•
x2-9
x+2
÷
2
x+2

(3)
x+2
x2-2x
-
x-1
x2-4x+4
.                      
(4)
x2
x-1
-(x-1)
答案
(1)原式=
a6
4b2
×(-
b3
a6
)×
b2
4

=-
b3
16

(2)原式=
2(x+2)
(x-3)2
×
1
x+2
×
(x+3)(x-3)
x+2
×
x+2
2

=
x+3
x-3

(3)原式=
x+2
x(x-2)
-
x-1
(x-2)2

=
(x+2)(x-2)
x(x-2)2
-
x(x-1)
x(x-2)2

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

=
x-4
x(x-2)2

(4)原式=
x2
x-1
-
(x-1)2
x-1

=
x2-x2+2x-1
x-1

=
2x-1
x-1
举一反三
先化简,再求值:(
2
a+1
+
a+2
a2-1
a
a-1
,其中a=2.
题型:解答题难度:一般| 查看答案
计算:
(1)(
x2
x+2
-
4
x+2
x-2
x

(2)
x-1
x+2
÷
x2-2x+1
x2-4
+
1
x-1
题型:解答题难度:一般| 查看答案
请你先将式子 
2011a
a2-2a+1
÷(1+
1
a-1
)化简,然后从0,1,2中选择一个数作为a的值,代入其中求值.
题型:解答题难度:一般| 查看答案
先化简,再求值:
(1)
x2-y2
x+y
-2(x+y)
,其中x=3,y=-
1
3

(2)(
3x
x-2
-
x
x+2
÷
2x
x2-4
,其中x=3.
题型:解答题难度:一般| 查看答案
计算与化简
(1)计算
a2-1
a2+6a+9
÷(a+1)×
a2-9
a-1

(2)(a2+b22-4a2b2
题型:解答题难度:一般| 查看答案
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