题目内容
求下面各比的比值 4:60 |
|
| ||||||
5.6:7 | 0.8:4 |
| ||||||
|
56:84. |
分析:求比值是根据比的意义(两个数相除又叫两个数的比),用比的前项除以比的后项.
解答:解:(1)4:60
=4÷60
=
(2)
:3
=
×
=
(3)
:
=
×
=
(4)5.6:7
=56÷70
=(56÷14)÷(70÷14)
=
(5)0.8:4
=8÷40
=(8÷8)÷(40÷8)
=1÷5
=
(6)
:
=
×25
=10
(7)
:0.7
=
:
=
×
=
(8)56:84
=(56÷28)÷(84÷28)
=2÷3
=
=4÷60
=
1 |
15 |
(2)
8 |
5 |
=
8 |
5 |
1 |
3 |
=
8 |
15 |
(3)
5 |
48 |
11 |
36 |
=
5 |
48 |
36 |
11 |
=
15 |
44 |
(4)5.6:7
=56÷70
=(56÷14)÷(70÷14)
=
4 |
5 |
(5)0.8:4
=8÷40
=(8÷8)÷(40÷8)
=1÷5
=
1 |
5 |
(6)
2 |
5 |
1 |
25 |
=
2 |
5 |
=10
(7)
5 |
6 |
=
5 |
6 |
7 |
10 |
=
5 |
6 |
10 |
7 |
=
25 |
21 |
(8)56:84
=(56÷28)÷(84÷28)
=2÷3
=
2 |
3 |
点评:此题考查比的基本性质的运用-化简比,要注意化简比的结果是一个整数或分数.
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