题目内容

计算各题,能简便运算的写出主要过程.
6.4÷
8
9
×
5
24
5
42
×
24
25
÷
36
35
(4-0.4)×(
2
9
+
2
3
[
3
8
-(
1
6
+
1
3
)]÷
1
12
(1)6.4÷
8
9
×
5
24

=6.4×
9
8
×
5
24

=
3
2


(2)
5
42
×
24
25
÷
36
35

=
1
21
×
12
5
×
35
36

=
1
9


(3)(4-0.4)×(
2
9
+
2
3
),
=3.6×(
2
9
+
6
9
),
=3.6×
8
9

=3.2;

(4)[
3
8
-(
1
6
+
1
3
)]÷
1
12

=(
3
8
-
1
2
)×12,
=-
1
8
×12,
=-
3
2
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