题目内容

计算下列各题,能简算的要简算.
(1)
4
5
+(
3
8
-
1
4

(2)2-
3
7
-
4
7

(3)
5
8
-
1
3
+
5
12

(4)68-7.5+32-2.5
(5)
5
12
-(
1
12
-
1
2
(1)
4
5
+(
3
8
-
1
4
),
=
4
5
+
1
8

=
37
40

(2)2-
3
7
-
4
7

=2-(
3
7
+
4
7
),
=2-1,
=1;
(3)
5
8
-
1
3
+
5
12

=
7
24
+
5
12

=
17
24

(4)68-7.5+32-2.5,
=(68+32)-(7.5+2.5),
=100-10,
=90;
(5)
5
12
-(
1
12
-
1
2

=
5
12
-
1
12
+
1
2

=
1
3
+
1
2

=
5
6
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