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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