问题 解答题
化简比.
4.2:0.7=
2
3
4
9
=
15
2
5
3
=
答案

(1)4.2:0.7=

4.2
0.7
=
42
7
=6:1;

(2)

2
3
4
9
=
2
3
×
9
4
=
3
2
=3:2;

(3)

15
2
5
3
=
15
2
×
3
5
=
9
2
=9:2.

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