题目内容
化简下面各比.
12:36 |
|
8:
| ||||||
0.75:0.25 |
|
|
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,进而把比化成最简比.
解答:解:(1)12:36
=(12÷12):(36÷12)
=1:3
(2)
:
=(
×63):(
×63)
=27:28
(3)8:
=(8×4):(
×4)
=32:1
(4)0.75:0.25
=(0.75÷0.25):(0.25÷0.25)
=3:1
(5)
:15
=(
×9):(15×9)
=2:135
(6)
:
=(
×32):(
×32)
=4:5
=(12÷12):(36÷12)
=1:3
(2)
3 |
7 |
4 |
9 |
=(
3 |
7 |
4 |
9 |
=27:28
(3)8:
1 |
4 |
=(8×4):(
1 |
4 |
=32:1
(4)0.75:0.25
=(0.75÷0.25):(0.25÷0.25)
=3:1
(5)
2 |
9 |
=(
2 |
9 |
=2:135
(6)
1 |
8 |
5 |
32 |
=(
1 |
8 |
5 |
32 |
=4:5
点评:此题考查了化简比的化简方法,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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