题目内容
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 4 |
| ( ) |
| 12 |
| 12 |
| ( ) |
分析:先把0.25化成分数得
,再根据分数的基本性质把
的分子分母同时乘12,化成分子是12的分数;根据分数的基本性质把
的分子分母同时乘3,化成分母是12的分数;根据除法与比的关系,把( ):
=
写成( )÷
=
,算出被除数,得
.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 16 |
解答:解:0.25=25÷100=
,
( ):
=
,
即( )÷
=
,
×
=
,
=
=
,
=
=
,
故答案为:
,3,48.
| 1 |
| 4 |
( ):
| 1 |
| 4 |
| 1 |
| 4 |
即( )÷
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 16 |
| 1 |
| 4 |
| 1×12 |
| 4×12 |
| 12 |
| 48 |
| 1 |
| 4 |
| 1×3 |
| 4×3 |
| 3 |
| 12 |
故答案为:
| 1 |
| 16 |
点评:此题考查了分数与除法、分数与比、比与除法之间的互化方法.
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