题目内容

计算下面各题,能简算的要简算.
12
7
-(
1
3
÷
7
15
+
4
5
)
11
5
×
3
7
-
4
5
÷
7
3

1
2
-
4
25
÷
2
5

30×(
2
5
+
1
6
)
(
3
7
+
1
34
)×7+
27
34

2.5-
5
11
-
6
11
.
(1)
12
7
-(
1
3
÷
7
15
+
4
5
),
=
12
7
-(
1
3
×
15
7
+
4
5
),
=
12
7
-(
5
7
+
4
5
),
=
12
7
-
5
7
-
4
5
,
=1-
4
5
,
=
1
5
;

(2)
11
5
×
3
7
-
4
5
÷
7
3
,
=
11
5
×
3
7
-
4
5
×
3
7
,
=(
11
5
-
4
5
)×
3
7
,
=
7
5
×
3
7
,
=
3
5
;

(3)
1
2
-
4
25
÷
2
5
,
=
1
2
-
4
25
×
5
2
,
=
1
2
-
2
5
,
=
5
10
-
4
10
,
=
1
10
;

(4)30×(
2
5
+
1
6
),
=30×
2
5
+30×
1
6
,
=12+5,
=17;

(5)(
3
7
+
1
34
)×7+
27
34
,
=
3
7
×7+
1
34
×7+
27
34
,
=3+
7
34
+
27
34
,
=3+1,
=4;

(6)2.5-
5
11
-
6
11
,
=2.5-(
5
11
+
6
11
),
=2.5-1,
=1.5.
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