题目内容

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
)

(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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