数学
计算:
(1)
15
-
10
5
;
(2)(4+
5
)(4-
5
)
简下列各式
(1)
10
2
-
98
2
;
(2)
(3
3
+
5
)(3
3
-
5
)
(2004·三明)计算
(2+
6
)÷
2
=
2
+
3
2
+
3
.
(2002·重庆)计算
3
+1
3
-1
-(3
2
-2
3
)(3
2
+2
3
)
=
3
-4
3
-4
.
(2000·杭州)计算:
2
3
÷(
1
6
+
1
2
)
=
3
6
-3
2
3
6
-3
2
.
(1999·重庆)计算(2
3
+
6
)(2
3
-
6
)+
3
-2
3
+2
=
4
3
-1
4
3
-1
.
(1998·山东)计算:
2
2
(2
12
+4
1
8
-3
48
)
=
8
6
+1
8
6
+1
.
(1997·重庆)计算:
1
3
·(2
12
-
147
)+
2
+1
2
-1
=
2
2
2
2
.
(2013·梧州一模)计算:
8
÷
2
+
8
×
2
=
6
6
.
(2013·河西区二模)计算:
12
+
8
×
6
=
6
3
6
3
.
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