问题 解答题
直接写得数.
7
2
×
4
21
=
1-
3
4
=
7+6.2=
10
9
÷1=
5
6
÷
5
12
=
7
9
×
9
28
=
2.5×
4
5
=
3
5
×
5
9
=
答案

直接写得数.

7
2
×
4
21
=
2
3
1-
3
4
=
1
4
7+6.2=13.2
10
9
÷1=1
1
9
5
6
÷
5
12
=2
7
9
×
9
28
=
1
4
2.5×
4
5
=2
3
5
×
5
9
=
1
3

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