题目内容

5
8
+
7
9
+
3
8

25
18
-
2
5
-
3
5

2
3
+
7
10
+
1
3
+
3
10

5
9
-
5
12
+
4
9

8
9
-(
1
5
-
1
9
)

5
12
+
11
15
-
6
15
+
7
12
(1)
5
8
+
7
9
+
3
8

=(
5
8
+
3
8
)+
7
9

=1+
7
9

=1
7
9


(2)
25
18
-
2
5
-
3
5

=
25
18
-(
2
5
+
3
5
),
=
25
18
-1,
=
7
18


(3)
2
3
+
7
10
+
1
3
+
3
10

=(
2
3
+
1
3
)+(
7
10
+
3
10
),
=1+1,
=2;

(4)
5
9
-
5
12
+
4
9

=(
5
9
+
4
9
)-
5
12

=1-
5
12

=
7
12


(5)
8
9
-(
1
5
-
1
9
),
=
8
9
-
1
5
+
1
9

=(
8
9
+
1
9
)-
1
5

=1-
1
5

=
4
5


(6)
5
12
+
11
15
-
6
15
+
7
12

=(
5
12
+
7
12
)+(
11
15
-
6
15
),
=1+
1
3

=1
1
3
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