题目内容
先化简比,再求比值.
(1)0.25:
|
(2)
|
分析:(1)根据比的基本性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变,即可化简比;
(2)用比的前项除以后项即可求其比值.
(2)用比的前项除以后项即可求其比值.
解答:解:(1)0.25:
,
=
:
,
=(
×4):(
×4),
=1:3;
0.25:
,
=
:
,
=
÷
,
=
;
(2)
:0.01,
=
:
,
=(
×100):(
×100),
=10:1;
:0.01,
=
:
,
=
÷
,
=10;
3 |
4 |
=
1 |
4 |
3 |
4 |
=(
1 |
4 |
3 |
4 |
=1:3;
0.25:
3 |
4 |
=
1 |
4 |
3 |
4 |
=
1 |
4 |
3 |
4 |
=
1 |
3 |
(2)
1 |
10 |
=
1 |
10 |
1 |
100 |
=(
1 |
10 |
1 |
100 |
=10:1;
1 |
10 |
=
1 |
10 |
1 |
100 |
=
1 |
10 |
1 |
100 |
=10;
点评:此题主要考查了化简比和求比值的方法,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;而求比值的结果是一个商,可以是整数,小数或分数.
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