题目内容
化简.
| 35:180 |
|
2.8:2.4 | 0.5:
| ||||||
7:
|
28:
|
0.6:4.8 |
|
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)35:180
=(35÷5):(180÷7)
=7:36;
(2)
:
.
=(
×28):(
×28)
=21:20;
(3)2.8:2.4
=(2.8÷0.4):(2.4÷0.4)
=7:L66;
(4)0.5:
=(0.5×10):(
×10)
=5:1;
(5)7:
=(7×6):(
×6)
=42:5;
(6)28:
=(28×8):(
×8)
=224:7;
(7)0.6:4.8
=(0.6÷0.6):(4.8÷0.6)
=1:8;
(8)
:12
=(
÷
)(12÷
)
=1:16.
=(35÷5):(180÷7)
=7:36;
(2)
| 3 |
| 4 |
| 5 |
| 7 |
=(
| 3 |
| 4 |
| 5 |
| 7 |
=21:20;
(3)2.8:2.4
=(2.8÷0.4):(2.4÷0.4)
=7:L66;
(4)0.5:
| 1 |
| 10 |
=(0.5×10):(
| 1 |
| 10 |
=5:1;
(5)7:
| 5 |
| 6 |
=(7×6):(
| 5 |
| 6 |
=42:5;
(6)28:
| 7 |
| 8 |
=(28×8):(
| 7 |
| 8 |
=224:7;
(7)0.6:4.8
=(0.6÷0.6):(4.8÷0.6)
=1:8;
(8)
| 3 |
| 4 |
=(
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=1:16.
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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