题目内容

2
5
+
2
9
+
7
9
7
13
+
3
4
-
6
13
2
3
-
2
7
+
5
7
9
8
-
1
7
+
1
8
-
6
7
5
9
-
1
3
+
5
6
11
8
-(
3
10
+
3
8
)-
7
10
.
(1)
2
5
+
2
9
+
7
9
,
=
2
5
+(
2
9
+
7
9
),
=
2
5
+1,
=1
2
5
;

(2)
7
13
+
3
4
-
6
13
,
=
7
13
-
6
13
+
3
4
,
=
1
13
+
3
4
,
=
43
52
;

(3)
2
3
-
2
7
+
5
7
,
=
2
3
+(
5
7
-
2
7
),
=
2
3
+
3
7
,
=
23
21
;

(4)
9
8
-
1
7
+
1
8
-
6
7
,
=(
9
8
+
1
8
)-(
1
7
+
6
7
),
=
10
8
-1,
=
1
4
;

(5)
5
9
-
1
3
+
5
6
,
=
2
9
+
5
6
,
=
19
18
;

(6)
11
8
-(
3
10
+
3
8
)-
7
10
,
=
11
8
-
3
10
-
3
8
-
7
10
,
=(
11
8
-
3
8
)-(
3
10
+
7
10
),
=1-1,
=0.
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