题目内容
化简比 (1)56:48= |
12:18= | ||||||||
(2)
|
| ||||||||
(3)1.8:0.09= | 0.8:0.04= | ||||||||
(4)0.75:
|
|
分析:根据比的基本性质,即比的前项和后项同时乘或除以一个相同的数(0除外)比值不变,进而把比化成最简比.
解答:解:(1)56:48
=(56÷8):(48÷8)
=7:6;
12:18
=(12÷6):(18÷6)
=2:3;
(2)
:
=(
×12):(
×12)
=10:9;
:
=(
×75):(
×75)
=20:12
=5:3;
(3)1.8:0.09
=(1.8×100):(0.09×100)
=180:9
=20:1;
0.8:0.04
=(0.8×25):(0.04×25)
=20:1;
(4)0.75:
=(
×16):(
×16)
=12:9
=4:3;
:0.4
=(
×5):(0.4×5)
=4:2
=2:1.
=(56÷8):(48÷8)
=7:6;
12:18
=(12÷6):(18÷6)
=2:3;
(2)
5 |
6 |
3 |
4 |
=(
5 |
6 |
3 |
4 |
=10:9;
4 |
15 |
4 |
25 |
=(
4 |
15 |
4 |
25 |
=20:12
=5:3;
(3)1.8:0.09
=(1.8×100):(0.09×100)
=180:9
=20:1;
0.8:0.04
=(0.8×25):(0.04×25)
=20:1;
(4)0.75:
9 |
16 |
=(
3 |
4 |
9 |
16 |
=12:9
=4:3;
4 |
5 |
=(
4 |
5 |
=4:2
=2:1.
点评:此题考查化简比的方法,注意化简比的结果仍是一个比,它的前项和后项都是整数,并且是互质数.
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