问题 解答题
直接写得数.
5
8
×
2
5
=
4
21
×
7
8
=
0.9×
3
4
=
39×
1
13
=
8
15
×
9
10
=
80×
3
4
×
1
3
=
答案

5
8
×
2
5
=
1
4
4
21
×
7
8
=
1
6
;0.9×
3
4
=
27
40

39×

1
13
=3;
8
15
×
9
10
=
12
25
; 80×
3
4
×
1
3
=20.

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