题目内容

计算,能简算的要简算.
3
8
+
5
12
3
8
+
1
6
-
1
4
8
9
-(
2
9
+
1
3
)
7
12
+
3
4
+
5
12
+
1
4
4-
11
15
-
4
15
5
6
-
2
3
+
1
9
.
(1)
3
8
+
5
12
,
=
9
24
+
10
24
,
=
19
24
;

(2)
3
8
+
1
6
-
1
4
,
=
3
8
-
1
4
+
1
6
,
=
1
8
+
1
6
,
=
7
24
;

(3)
8
9
-(
2
9
+
1
3
),
=
8
9
-
2
9
-
1
3
,
=
2
3
-
1
3
,
=
1
3
;

(4)
7
12
+
3
4
+
5
12
+
1
4
,
=(
7
12
+
5
12
)+(
3
4
+
1
4
),
=1+1,
=2;

(5)4-
11
15
-
4
15
,
=4-(
11
15
+
4
15
),
=4-1,
=3;

(6)
5
6
-
2
3
+
1
9
,
=
1
6
+
1
9
,
=
5
18
.
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