题目内容
化简比. 56:32= |
1.8:0.09= |
| ||||||
|
4.6:6.9= |
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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,据此解答.
解答:解:(1)56:32
=(56÷8):(32÷8)
=7:4;
(2)1.8:0.09
=(1.8×100):(0.09×100)
=180:9
=(180÷9):(9÷9)
=20:1;
(3)
=
=
;
(4)
:
=(
×15):(
×15)
=5:6;
(5)4.6:6.9
=(4.6×10):(6.9×10)
=46:69
=(46÷23):(69÷23)
=2:3;
(6)
:0.25
=
:
=(
×8):(
×8)
=3:2.
=(56÷8):(32÷8)
=7:4;
(2)1.8:0.09
=(1.8×100):(0.09×100)
=180:9
=(180÷9):(9÷9)
=20:1;
(3)
2 |
46 |
(2÷2) |
(46÷2) |
1 |
23 |
(4)
1 |
3 |
2 |
5 |
=(
1 |
3 |
2 |
5 |
=5:6;
(5)4.6:6.9
=(4.6×10):(6.9×10)
=46:69
=(46÷23):(69÷23)
=2:3;
(6)
3 |
8 |
=
3 |
8 |
1 |
4 |
=(
3 |
8 |
1 |
4 |
=3:2.
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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