题目内容
求下面各比的比值.
2.5:0.45 1
:1
40分钟:
时..
2.5:0.45 1
3 |
4 |
2 |
5 |
5 |
3 |
解(1)2.5:0.45,
=(2.5×20):(0.45×20),
=50:9,
=5
;
(2)1
:1
,
=
:
,
=(
×
):(
×
),
=5:4,
=1
;
(3)40分钟:
时,
=
时:
时,
=(
×3):(
×3),
=2:5,
=
.
=(2.5×20):(0.45×20),
=50:9,
=5
5 |
9 |
(2)1
3 |
4 |
2 |
5 |
=
7 |
4 |
7 |
5 |
=(
7 |
4 |
20 |
7 |
7 |
5 |
20 |
7 |
=5:4,
=1
1 |
4 |
(3)40分钟:
5 |
3 |
=
2 |
3 |
5 |
3 |
=(
2 |
3 |
5 |
3 |
=2:5,
=
2 |
5 |
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