计算:(1)8+32-2(2)(18-48)÷(0.5-213-32)(3)(x+y)•x2x2-y2+y2y-x(4)2x-6x-2÷(5x-2-x-2).

计算:(1)8+32-2(2)(18-48)÷(0.5-213-32)(3)(x+y)•x2x2-y2+y2y-x(4)2x-6x-2÷(5x-2-x-2).

题型:解答题难度:一般来源:不详
计算:
(1)


8
+


32
-


2

(2)(


1
8
-


48
)÷(


0.5
-2


1
3
-


32
)

(3)(x+y)•
x2
x2-y2
+
y2
y-x

(4)
2x-6
x-2
÷(
5
x-2
-x-2)
答案
(1)原式=2


2
+4


2
-


2

=5


2


(2)原式=(
1
4


2
-4


3
)÷(
1
2


2
-
2
3


3
-4


2

=
1
4


2
-4


3
-
7
2


2
-
2
3


3

=
(
1
4


2
-4


3
)(
7
2


2
-
2
3


3
)
-(
7
2


2
+
2
3


3
)(
7
2


2
-
2
3


3
)

=-
39
4
-
44
3


6
13
6

=
9
2
-
88
13


6


(3)原式=
x2
x-y
-
y2
x-y

=
x2-y2
x-y

=x+y;

(4)原式=
2(x-3)
x-2
÷
5-(x+2)(x-2)
x-2

=
2(x-3)
x-2
÷
9-x2
x-2

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

=-
2
x+3
举一反三
化简(1-
1
a-2
3-a
2a-4
的结果是______.
题型:解答题难度:一般| 查看答案
化简(x-
1
y
)÷(y-
1
x
)的结果为(  )
A.1B.
x
y
C.
y
x
D.-1
题型:单选题难度:一般| 查看答案
先化简,再求值:
a2-b 2
(a-b)(a-c)
+
c2-b2
(a-b)(c-a)
,其中a=3,b=-2,c=-1.
题型:解答题难度:一般| 查看答案
计算:(1)
x2+9x
x2+3x
+
x2-9
x2+6x+9

(2)
2-x
x-1
÷(x+1-
3
x-1
)
题型:解答题难度:一般| 查看答案
下列式子成立的是(  )
A.
b
a
+
2
b
=
b+2
a+b
B.
m+3
m
=3
C.(
y
x2
)2=
y2
x2
D.
n2
mn
=
n
m
题型:单选题难度:简单| 查看答案
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