问题 解答题
直接写得数.
2
5
×
5
8
=
2
3
=
1
2
×(1-
1
4
)
=
8
9
×
3
8
=
3
5
×
3
5
=
5
16
×
8
15
=
1
4
×
1
3
×
2
5
=
答案

2
5
×
5
8
=
1
4
2
3
=2,
1
2
×(1-
1
4
)
=
3
8
8
9
×
3
8
=
1
3
3
5
×
3
5
=
9
25
5
16
×
8
15
=
1
6
1
4
×
1
3
×
2
5
=
1
30

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