题目内容

3
4
+
5
6
-
7
8
6
7
-(
11
14
-
1
2
7
8
-
4
5
+
9
8
-
1
5
7
12
+(
5
12
-
3
4
6-
3
11
-
8
11
5
9
+
9
8
+
4
9
+
7
8
解;(1)
3
4
+
5
6
-
7
8

=
18
24
+
20
24
-
21
24

=
17
24


(2)
6
7
-(
11
14
-
1
2
),
=
6
7
-
2
7

=
4
7


(3)
7
8
-
4
5
+
9
8
-
1
5

=(
7
8
+
9
8
)-(
4
5
+
1
5
),
=2-1,
=1;

(4)
7
12
+(
5
12
-
3
4
),
=
7
12
+
5
12
-
3
4

=1-
3
4

=
1
4


(5)6-
3
11
-
8
11

=6-(
3
11
+
8
11
),
=6-1,
=5;

(6)
5
9
+
9
8
+
4
9
+
7
8

=(
5
9
+
4
9
)+(
9
8
+
7
8
),
=1+2,
=3.
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