题目内容
化简比
| 0.4:
| 0.25:
| 0.4:0.36 | ||||||||
| 4.8:0.72 | 0.25:
| 0.4:
|
|
考点:求比值和化简比
专题:比和比例
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.
解答:
解:(1)
:
=(
×2):(
×2)
=9:1;
(2)0.4:
=(0.4×20):(
×20)
=8:5;
(3)0.25:
=(0.25×20):(
×20)
=5:36;
(4)0.4:0.36
=(0.4×25):(0.36×25)
=1:9;
(5)4.8:0.72
=(4.8×
):(0.72×
)
=20:3;
(6)0.25:
=(0.25×16):(
×16)
=4:3;
(7)0.4:
=(0.4×20):(
×20)
=8:15;
(8)
:
=(
×
):(
×
)
=4:3.
| 9 |
| 2 |
| 1 |
| 2 |
=(
| 9 |
| 2 |
| 1 |
| 2 |
=9:1;
(2)0.4:
| 1 |
| 4 |
=(0.4×20):(
| 1 |
| 4 |
=8:5;
(3)0.25:
| 9 |
| 5 |
=(0.25×20):(
| 9 |
| 5 |
=5:36;
(4)0.4:0.36
=(0.4×25):(0.36×25)
=1:9;
(5)4.8:0.72
=(4.8×
| 25 |
| 6 |
| 25 |
| 6 |
=20:3;
(6)0.25:
| 3 |
| 16 |
=(0.25×16):(
| 3 |
| 16 |
=4:3;
(7)0.4:
| 3 |
| 4 |
=(0.4×20):(
| 3 |
| 4 |
=8:15;
(8)
| 3 |
| 4 |
| 9 |
| 16 |
=(
| 3 |
| 4 |
| 16 |
| 3 |
| 9 |
| 16 |
| 16 |
| 3 |
=4:3.
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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