题目内容

8
9
+
2
3
5
4
-
4
5
3
8
+
5
12
7
6
-
3
10
7
5
+
4
9
+
5
9
+
3
5
3
4
-
1
3
+
5
6
3-
5
11
-
17
11
(1)
8
9
+
2
3

=
8
9
+
6
9

=
14
9


(2)
5
4
-
4
5

=
25
20
-
16
20

=
9
20


(3)
3
8
+
5
12

=
9
24
+
10
24

=
19
24


(4)
7
6
-
3
10

=
35
30
-
9
30

=
13
15


(5)
7
5
+
4
9
+
5
9
+
3
5

=(
7
5
+
3
5
)+(
4
9
+
5
9
),
=2+1,
=3;

(6)
3
4
-
1
3
+
5
6

=
9
12
-
4
12
+
10
12

=
9-4+10
12

=
5
4


(7)3-
5
11
-
17
11

=3-(
5
11
+
17
11
),
=3-2,
=1.
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