把下例各連比化為最簡(jiǎn)整數(shù)比:
2:4:8=
3:9:12=
18:20:18= 15:20:35=
1
2
1
3
1
6
=
1
2
1
3
3
4
=
2
5
5
4
8
5
=
1
1
8
:1
1
4
3
2
=
0.75:0.25:1.25= 0.3:0.15:0.45=
0.72:0.12:2.4=
分析:根據(jù)比的基本性質(zhì)作答,即比的前項(xiàng)和后項(xiàng)同時(shí)乘一個(gè)數(shù)或除以一個(gè)數(shù)(0除外)比值不變.
解答:

解:2:4:8=1:2:4,

3:9:12=1:3:4,
18:20:18=9:10:9,

15:20:35=3:4:7,
1
2
1
3
1
6
=3:2:1,

1
2
1
3
3
4
=6:4:9,
2
5
5
4
8
5
=8:25:32,

1
1
8
:1
1
4
3
2
=9:10:12,
0.75:0.25:1.25=3:1:5,

0.3:0.15:0.45=1:5:15,
0.72:0.12:2.4=6:1:20.
點(diǎn)評(píng):此題主要考查了化簡(jiǎn)比的方法,另外還要注意化簡(jiǎn)比的結(jié)果是一個(gè)比,它的前項(xiàng)和后項(xiàng)都是整數(shù),并且是互質(zhì)數(shù).
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