问题 解答题
计算.
1-
3
8
+
1
6
3
5
9
-
1
3
+
1
9

4
13
+
3
8
-
4
13

9
10
-(
1
5
-
1
6
)
答案

(1)1-

3
8
+
1
6

=

5
8
+
1
6

=

19
24

(2)

5
9
-(
1
3
+
1
9
),

=

5
9
-
4
9

=

1
9

(3)

4
13
+
3
8
-
4
13

=

4
13
-
4
13
+
3
8

=

3
8

(4)

9
10
-(
1
5
-
1
6
),

=

9
10
-
1
30

=

14
15

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