题目内容
化简各比并求出比值.
(1)0.46:23;
(2)0.125:
;
(3)
:
.
(1)0.46:23;
(2)0.125:
7 |
8 |
(3)
7 |
12 |
3 |
8 |
分析:(1)根据比的性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变,把比化成最简比即可;
(2)根据求比值的方法,用最简比的前项除以后项即得比值.
(2)根据求比值的方法,用最简比的前项除以后项即得比值.
解答:解:(1)0.46:23
=(0.46÷0.46):(23÷0.46)
=1:50
0.46:23
=0.46÷23
=
;
(2)0.125:
=
:
=(
×8):(
×8)
=1:7;
0.125:
=0.125÷
=
;
(3)
:
=(
×24):(
×24)
=14:9
:
=
÷
=
×
=
.
=(0.46÷0.46):(23÷0.46)
=1:50
0.46:23
=0.46÷23
=
1 |
50 |
(2)0.125:
7 |
8 |
=
1 |
8 |
7 |
8 |
=(
1 |
8 |
7 |
8 |
=1:7;
0.125:
7 |
8 |
=0.125÷
7 |
8 |
=
1 |
7 |
(3)
7 |
12 |
3 |
8 |
=(
7 |
12 |
3 |
8 |
=14:9
7 |
12 |
3 |
8 |
=
7 |
12 |
3 |
8 |
=
7 |
12 |
8 |
3 |
=
14 |
9 |
点评:此题考查化简比和求比值的方法,要注意区分:化简比是根据比的基本性质进行化简的,结果仍是一个比;求比值是用比的前项除以后项所得的商,结果是一个数.
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