问题 解答题
直接写得数
1
2
×
1
3
=
2
3
×
1
2
=
3
4
×
2
5
=
7
9
×
3
4
=
6
7
×
5
6
=
2
5
×
2
3
=
1
6
×
8
15
=
9
25
×
5
6
=
12
13
×
1
4
=
答案

1
2
×
1
3
=
1
6
2
3
×
1
2
=
1
3
3
4
×
2
5
=
3
10
7
9
×
3
4
=
7
12
6
7
×
5
6
=
5
7
2
5
×
2
3
=
4
15
1
6
×
8
15
=
4
45
9
25
×
5
6
=
3
10
12
13
×
1
4
=
3
13

单项选择题
单项选择题