问题 解答题
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
答案

(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

问答题 简答题
判断题