题目内容

下面各题能简算的要简算.
6
7
-(
1
5
+
1
4

3
8
+(
4
9
+
5
8

7
12
-(
2
3
-
5
12
1-
1
7
-
1
4
(1)
6
7
-(
1
5
+
1
4

=
6
7
-
9
20

=
57
140


(2)
3
8
+(
4
9
+
5
8

=
3
8
+
5
8
+
4
9

=1+
4
9

=1
4
9


(3)
7
12
-(
2
3
-
5
12

=
7
12
+
5
12
-
2
3

=1-
2
3

=
1
3


(4)1-
1
7
-
1
4

=
6
7
-
1
4

=
17
28
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