问题 解答题
计算.
7
9
+
5
6
-
2
3
3
4
-
5
8
+
5
12
3
5
-(
5
8
-
1
6
2
3
+(
1
4
+
3
8
9
13
-(
7
10
-
1
2
2
5
+(
5
6
-
2
3
答案

(1)

7
9
+
5
6
-
2
3

=

14
18
+
15
18
-
12
18

=

17
18

(2)

3
4
-
5
8
+
5
12

=

18
24
-
15
24
+
10
24

=

13
24

(3)

3
5
-(
5
8
-
1
6
),

=

3
5
-
11
24

=

17
120

(4)

2
3
+(
1
4
+
3
8
),

=

2
3
+
5
8

=

31
24

(5)

9
13
-(
7
10
-
1
2
),

=

9
13
-
1
5

=

32
65

(6)

2
5
+(
5
6
-
2
3
),

=

2
5
+
1
6

=

17
30

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