题目内容
(2013?北京模拟)(2
×3.6+3
×7
)÷
÷
=
| 1 |
| 2007 |
| 3 |
| 5 |
| 2006 |
| 2007 |
| 3 |
| 4 |
| 3 |
| 5 |
80
80
.分析:式中3.6=3
,所以本题可据分配律进行巧算.
| 3 |
| 5 |
解答:解:(2
×3.6+3
×7
)÷
÷
,
=(2
×3.6+3.6×7
)÷(
×
)
=[(2
+7
)×3
]÷
,
=[10×3.6]÷
,
=36×
,
=80;
故答案为:80.
| 1 |
| 2007 |
| 3 |
| 5 |
| 2006 |
| 2007 |
| 3 |
| 4 |
| 3 |
| 5 |
=(2
| 1 |
| 2007 |
| 2006 |
| 2007 |
| 3 |
| 4 |
| 3 |
| 5 |
=[(2
| 1 |
| 2007 |
| 2006 |
| 2007 |
| 6 |
| 5 |
| 9 |
| 20 |
=[10×3.6]÷
| 9 |
| 20 |
=36×
| 20 |
| 9 |
=80;
故答案为:80.
点评:完成此类题目要细心分析式中数据,将式中小数、分数进行合理的互化.
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