题目内容

计算下面各题.
(
2
5
+
5
9
×6)÷
8
15
[
1
4
-(
4
5
-
3
4
)]÷
3
25
(
1
2
-
1
4
)÷(
1
5
+
1
2
)
1
2
÷(
1
4
+
3
5
)×
3
5
.
(1)(
2
5
+
5
9
×6)÷
8
15
,
=(
2
5
+
10
3
)×
15
8
,
=(
6
15
+
50
15
)×
15
8
,
=
56
15
×
15
8
,
=7;

(2)[
1
4
-(
4
5
-
3
4
)]÷
3
25
,
=[
1
4
-(
16
20
-
15
20
)]×
25
3
,
=[
1
4
-
1
20
]×
25
3
,
=
1
5
×
25
3
,
=
5
3
;

(3)(
1
2
-
1
4
)÷(
1
5
+
1
2
),
=
1
4
÷(
2
10
+
5
10
),
=
1
4
×
10
7
,
=
5
14
;

(4)
1
2
÷
(
1
4
+
3
5
)×
3
5
,
=
1
2
÷(
5
20
+
12
20
)×
3
5
,
=
1
2
÷
17
20
×
3
5
,
=
1
2
×
20
17
×
3
5
,
=
6
17
;
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