数学
计算:
24
-
18
×
1
3
=
6
6
;②
2+
2
2
=
2
+1
2
+1
.
(
2
+
3
)(
3
-
6
)=
6
-2
3
+3-3
2
6
-2
3
+3-3
2
.
计算:
2
×
6
3
-1
=
2
2
.
3
×
6
-
2
=
2
2
2
2
.
计算:
1
25
=
1
5
1
5
,
0.0001
=
0.01
0.01
,
(-2
6
)
2
=
24
24
,
3
5a
×2
10a
=
30
2
a
30
2
a
,
27
-
12
+
45
=
3
+3
5
3
+3
5
,
(
3
-
5
)
2
=
8-2
15
8-2
15
.
计算:
(1)
12
+|-
3
|-(-2006)
0
+(
1
2
)
-1
=
3
3
+1
3
3
+1
,
(2)
15
÷(
5
-
3
)=
5
3
+3
5
2
5
3
+3
5
2
,
(3)
1
2-
3
-(2
3
+2)=
-
3
-
3
.
计算:
3
×
6
+
2
=
4
2
4
2
.
计算:
(
2
)
2
=
2
2
;
(1-
2
)
2
=
2
-1
2
-1
;
15
×
6
=
3
10
3
10
;(
3
+2)
2010
(
3
-2)
2011
=
3
-2
3
-2
;
若xy<0,则
x
2
y
=
-x
y
-x
y
.
(2010·临沂)若x-y=
2
-1
,xy=
2
,则代数式(x-1)(y+1)的值等于( )
(2006·济南)已知x=
2
,则代数式
x
x-1
的值为( )
(2005·荆州)若
a=
1
2
-1
,b=
1
2
+1
,则
ab
(
a
b
-
b
a
)
的值为( )
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