题目内容

计算下面各题,怎样算简便就怎样算.
1
10
÷
3
20
-
5
8
×
2
5

5
8
-
6
25
÷
2
5
+
1
4

1
8
×
5
9
+
4
9
÷8

[
5
6
-(
1
2
-
1
3
)]×
9
10
.

(1)
1
10
÷
3
20
-
5
8
×
2
5
,
=
2
3
-
1
4
,
=
5
12
;

(2)
5
8
-
6
25
÷
2
5
+
1
4
,
=
5
8
-
3
5
+
1
4
,
=
1
40
+
1
4
,
=
11
40
;

(3)
1
8
×
5
9
+
4
9
÷8
,
=
1
8
×
5
9
+
4
9
×
1
8
,
=
1
8
×(
5
9
+
4
9
),
=
1
8
;

(4)[
5
6
-(
1
2
-
1
3
)]×
9
10
,
=[
5
6
-
1
6
]×
9
10
,
=
2
3
×
9
10
,
=
3
5
.
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