题目内容
求比值
15:
|
35%:4 |
|
0.4小时:45分. |
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)15:
,
=15÷
,
=15×4,
=60;
(2)35%:4,
=
:4,
=
÷4,
=
×
,
=
;
(3)
:
,
=
÷
,
=
×
,
=
;
(4)0.4小时:45分,
=24分:45分,
=24÷45,
=
.
1 |
4 |
=15÷
1 |
4 |
=15×4,
=60;
(2)35%:4,
=
7 |
20 |
=
7 |
20 |
=
7 |
20 |
1 |
4 |
=
7 |
80 |
(3)
4 |
5 |
8 |
9 |
=
4 |
5 |
8 |
9 |
=
4 |
5 |
9 |
8 |
=
9 |
10 |
(4)0.4小时:45分,
=24分:45分,
=24÷45,
=
8 |
15 |
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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求比值
15:![]() | 35%:4 | ![]() ![]() | 0.4小时:45分. |