数学
计算
(
7
)
2
=
7
7
;计算
15
5
=
3
3
(
6
-
3
)
2
=
9-
6
2
9-
6
2
.
化简:
(1)
(-4)
2
=
4
4
.
(2)
24
÷
3
=
2
2
2
2
.
计算
-
1
2
24
×
1
3
=
-
2
-
2
.
(
2
+
3
)
2009
(
2
-
3
)
2010
=
3
-
2
3
-
2
.
化简
18a
·
8
a
3
=
12a
2
12a
2
.
3
=n
,用含n的式子表示
12
=
2n
2n
.
计算:
(3-π)
2
=
π-3
π-3
,
(-
2
3
6
)
2
=
8
3
8
3
.
3
×
12
=
6
6
.
计算:(1)
9
=
3
3
(2)
12
=
2
3
2
3
(3)
2
×
3
=
6
6
(4)
15
3
=
5
5
(5)
1
2
=
2
2
2
2
(6)
8
-2
2
=
0
0
(7)
3
(
6
-
3
)
=
3
2
-3
3
2
-3
(8)
6
-
2
2
=
3
-1
3
-1
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