题目内容

计算.
5
6
-
1
4
+
1
3
23
28
+(
13
14
+
2
7
)
7-(
3
4
-
2
5
)
5-
3
7
-
4
7
1
6
+
3
8
+
5
8
5
9
-(
5
6
-
7
12
)
.

(1)
5
6
-
1
4
+
1
3
,
=
7
12
+
1
3
,
=
11
12
;

(2)
23
28
+(
13
14
+
2
7
),
=
23
28
+
17
14
,
=
57
28
;

(3)7-(
3
4
-
2
5
),
=7-
7
20
,
=6
13
20
;

(4)5-
3
7
-
4
7
,
=5-(
3
7
+
4
7
),
=5-1,
=4;

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

(6)
5
9
-(
5
6
-
7
12
)
,
=
5
9
-
1
4
,
=
11
36
.
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