问题 填空题
12:______=1÷______=
3
5
=
()
25
=______%
答案

(1)

3
5
=3÷5=(3×4):(5×4)=12:20;

(2)

3
5
=3:5=(3÷3):(5÷3)=1:
5
3
=1÷
5
3

(3)

3
5
=
3×5
5×5
=
15
25

(4)

3
5
=0.6=60%.

故答案为:20,

5
3
,15,60.

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