题目内容
化简下列各比 18:9 |
2.5:0.5 | 36:
| ||||||
0.6:
|
|
0.7:0.08. |
分析:根据比的基本性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变.
解答:解:(1)18:9,
=(18÷9):(9÷9),
=2:1;
(2)2.5:0.5,
=(2.5×2):(0.5×2),
=5:1;
(3)36:
,
=(36×
):(
×
),
=90:1;
(4)0.6:
,
=(0.6×30):(
×30),
=18:5;
(5)
:
,
=(
×8):(
×8),
=5:2;
(6)0.7:0.08,
=(0.7×50)(0.08×50),
=35:4.
=(18÷9):(9÷9),
=2:1;
(2)2.5:0.5,
=(2.5×2):(0.5×2),
=5:1;
(3)36:
2 |
5 |
=(36×
5 |
2 |
2 |
5 |
5 |
2 |
=90:1;
(4)0.6:
1 |
6 |
=(0.6×30):(
1 |
6 |
=18:5;
(5)
5 |
8 |
1 |
4 |
=(
5 |
8 |
1 |
4 |
=5:2;
(6)0.7:0.08,
=(0.7×50)(0.08×50),
=35:4.
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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