题目内容
求比值.
:
0.12:
15:
.
2 |
7 |
9 |
14 |
0.12:
1 |
3 |
15:
5 |
7 |
考点:求比值和化简比
专题:比和比例
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)
:
=
÷
=
×
=
;
(2)0.12:
=
:
=
÷
=
;
(3)15:
=15÷
=15×
=21.
2 |
7 |
9 |
14 |
=
2 |
7 |
9 |
14 |
=
2 |
7 |
14 |
9 |
=
4 |
9 |
(2)0.12:
1 |
3 |
=
3 |
25 |
1 |
3 |
=
3 |
25 |
1 |
3 |
=
9 |
25 |
(3)15:
5 |
7 |
=15÷
5 |
7 |
=15×
7 |
5 |
=21.
点评:求比值是用比的前项除以后项,小数化成分数进行计算,结果最好用分数表示.
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