问题 解答题
化简下列各比,并求出比值.
3:2.5
2
5
:2
5
6
5
9
0.75小时:15分.
答案

3:2.5,

=(3×10):(2.5×10),

=30:25,

=(30÷5):(25÷5),

=6:5;

3:2.5,

=3÷2.5,

=1.2,

2
5
:2,

=(

2
5
×
5
2
):(2×
5
2
),

=1:5;

2
5
:2,

=

2
5
:2,

=0.2;

5
6
5
9

=(

5
6
×
18
5
):(
5
9
×
18
5
),

=3:2;

5
6
5
9

=

5
6
÷
5
9

=1.5;

0.75小时:15分,

=45分:15分,

=45:15,

=(45÷15):(15÷15),

=3:1;

0.75小时:15分,

=45分:15分,

=45÷15,

=3.

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