题目内容
求下面各比的比值. 18:72 |
5:
|
0.15:3.5 | ||||||
|
1.2米:60厘米 |
|
分析:根据比的基本性质作答,即比的前项和后项同时乘一个数或除以一个数(0除外)比值不变.不同单位要首先化成相同的单位,然后化简比.
解答:解:18:72,
=(18÷18):(72÷18),
=1:4;
5:
,
=(5×5):(
×5),
=25:2;
0.15:3.5,
=(0.15×100):(3.5×100),
=15:350,
=(15÷5):(350÷5),
=3:70;
时:40分,
=80分:40分,
=80:40,
=(80÷40):(40÷40),
=2:1;
1.2米:60厘米,
=120厘米:60厘米,
=120:60,
=(120÷60):(60÷60),
=2:1;
:
,
=(
×
):(
×
),
=5:6.
=(18÷18):(72÷18),
=1:4;
5:
2 |
5 |
=(5×5):(
2 |
5 |
=25:2;
0.15:3.5,
=(0.15×100):(3.5×100),
=15:350,
=(15÷5):(350÷5),
=3:70;
4 |
3 |
=80分:40分,
=80:40,
=(80÷40):(40÷40),
=2:1;
1.2米:60厘米,
=120厘米:60厘米,
=120:60,
=(120÷60):(60÷60),
=2:1;
2 |
9 |
4 |
15 |
=(
2 |
9 |
45 |
2 |
4 |
15 |
45 |
2 |
=5:6.
点评:此题主要考查了化简比的方法,另外还要注意化简比的结果是一个比,它的前项和后项都是整数,并且是互质数.
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