问题 解答题
3
4
÷
7
8
÷
15
14

4
5
×
1
7
÷
2
5
答案

(1)

3
4
÷
7
8
÷
15
14

=

3
4
÷(
7
8
×
15
14

=

3
4
÷
15
16

=

4
5

(2)

4
5
×
1
7
÷
2
5

=

4
5
÷
2
5
×
1
7

=2×

1
7

=

2
7

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