题目内容

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.
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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