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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