题目内容

计算,能简算的要简算.
7
8
+
5
12
-
1
6
17
24
-
3
8
-
1
12
5
9
+
7
15
+
8
15
+
1
9
5
9
-(
5
6
-
7
12
)
10-
2
9
-
7
9
1-
7
9
-(
3
4
-
1
6
)
.
(1)
7
8
+
5
12
-
1
6
,
=
31
24
-
1
6
,
=1
1
8
;

(2)
17
24
-
3
8
-
1
12
,
=
8
24
-
1
12
,
=
1
4
;

(3)
5
9
+
7
15
+
8
15
+
1
9
,
=(
5
9
+
1
9
)+(
7
15
+
8
15
),
=
2
3
+
1,
=1
2
3
;

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

(5)10-
2
9
-
7
9
,
=10-(
2
9
+
7
9
),
=10-1,
=9;

(6)1-
7
9
-(
3
4
-
1
6
)
,
=1-
7
9
-
7
12
,
=
2
9
-
7
12
,
=-
13
36
.
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