问题 解答题
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
答案

(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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