题目内容
| 18:24 | 0.3:
| ||||||
| 0.65:0.75 |
| ||||||
|
10:
|
分析:(1)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;
(2)根据求比值的方法,就用最简比的前项除以后项即得比值.
(2)根据求比值的方法,就用最简比的前项除以后项即得比值.
解答:解:18:24
=(18÷6):(24÷6)
=3:4,
18:24=3:4=3÷4=
;
0.3:
=(0.3×10):(
×10)
=3:9
=1:3,
0.3:
=1:3=1÷3=
;
0.65:0.75
=(0.65×100):(0.75×100)
=65:75
=(65÷5):(75÷5)
=13:15,
0.65:0.75=13:15=13÷15=
;
:4
=(
×
):(4×
)
=2:9,
:4=2:9=2÷9=
;
:
=(
×40):(
×40)
=25:6,
:
=25:6=25÷6=
;
10:
=(10×5):(
×5)
=50:7,
10:
=50:7=50÷7=
.
=(18÷6):(24÷6)
=3:4,
18:24=3:4=3÷4=
| 3 |
| 4 |
0.3:
| 9 |
| 10 |
=(0.3×10):(
| 9 |
| 10 |
=3:9
=1:3,
0.3:
| 9 |
| 10 |
| 1 |
| 3 |
0.65:0.75
=(0.65×100):(0.75×100)
=65:75
=(65÷5):(75÷5)
=13:15,
0.65:0.75=13:15=13÷15=
| 13 |
| 15 |
| 8 |
| 9 |
=(
| 8 |
| 9 |
| 9 |
| 4 |
| 9 |
| 4 |
=2:9,
| 8 |
| 9 |
| 2 |
| 9 |
| 5 |
| 8 |
| 3 |
| 20 |
=(
| 5 |
| 8 |
| 3 |
| 20 |
=25:6,
| 5 |
| 8 |
| 3 |
| 20 |
| 25 |
| 6 |
10:
| 7 |
| 5 |
=(10×5):(
| 7 |
| 5 |
=50:7,
10:
| 7 |
| 5 |
| 50 |
| 7 |
点评:此题考查化简比和求比值的方法,要注意区分:化简比的结果是一个比;而求比值的结果是一个数.
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