问题 解答题
化简下列各比,并求比值.
4
5
2
3

8:0.04
2:
4
7
答案

(1)

4
5
2
3

=(

4
5
×15):(
2
3
×15
),

=12:10,

=(12÷2):(10÷2),

=6:5;

4
5
2
3

=6:5,

=6÷5,

=1.2;

(2)8:0.04,

=(8×25):(0.04×25),

=200:1;

8:0.04,

=200:1,

=200÷1,

=200;

(3)2:

4
7

=(2×7):(

4
7
×7),

=14:4,

=(14÷2):(4÷2),

=7:1;

2:

4
7

=7:1,

=7÷1;

=7.

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