题目内容

5
12
+
4
9
+
7
12
+
5
9

5
6
-(
1
5
+
1
6
)

1
7
8
-
4
5
-
1
5

2
7
+
3
14
+
4
21

7
8
-(
1
3
-
1
12
)

3
4
-
2
3
+
1
6
(1)
5
12
+
4
9
+
7
12
+
5
9

=(
5
12
+
7
12
)+(
4
9
+
5
9
),
=1+1,
=2;

(2)
5
6
-(
1
5
+
1
6
)

=
5
6
-
1
6
-
1
5

=
2
3
-
1
5

=
7
15


(3)1
7
8
-
4
5
-
1
5

=1
7
8
-(
4
5
+
1
5
),
=1
7
8
-1,
=
7
8


(4)
2
7
+
3
14
+
4
21

=
1
2
+
4
21

=
29
42


(5)
7
8
-(
1
3
-
1
12
)

=
7
8
-
1
12

=
19
24


(6)
3
4
-
2
3
+
1
6

=
1
12
+
2
12

=
1
4
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