问题 解答题
脱式计算.
2
5
×14×
15
28
4
5
÷14
2
3
÷
1
3
÷
3
7
答案

(1)

2
5
×14×
15
28

=

2
5
×(14×
15
28
),

=

2
5
×
15
2

=3;

(2)

4
5
÷14,

=

4
5
×
1
14

=

2
35

(3)

2
3
÷
1
3
÷
3
7

=

2
3
×3÷
3
7

=2÷

3
7

=2×

7
3

=

14
3

单项选择题 A1/A2型题
多项选择题