题目内容

计算下面各题,能简算的要简算.
7
8
-
5
12
+
1
6
4
3
-(
2
5
+
3
10
1
2
-(
3
4
-
3
8
5-
4
9
-
5
9
2
3
+(
1
2
-
1
4
2
5
+
1
3
+
3
5
(1)
7
8
-
5
12
+
1
6

=
21
24
-
10
24
+
4
24

=
5
8


(2)
4
3
-(
2
5
+
3
10
),
=
4
3
-
7
10

=
19
10


(3)
1
2
-(
3
4
-
3
8
),
=
1
2
-
3
8

=
1
8


(4)5-
4
9
-
5
9

=5-(
4
9
+
5
9
),
=5-1,
=4;

(5)
2
3
+(
1
2
-
1
4
),
=
2
3
+
1
4

=
11
12


(6)
2
5
+
1
3
+
3
5

=
2
5
+
3
5
+
1
3

=1
1
3
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