题目内容
计算
×9×
的乘积是多少?
| ||
| 2008个6 |
| ||
| 2008个3 |
分析:将
×9×
变形为(
×3)×(3×
),根据乘法分配律即可求解.
| ||
| 2008个6 |
| ||
| 2008个3 |
| ||
| 2008个6 |
| ||
| 2008个3 |
解答:解:
×9×
,
=(
×3)×(3×
),
=1
8×
,
=1
8×(1
-1),
=1
8
-1
8,
=1
6
2.
答:
×9×
的乘积是1
6
2.
| ||
| 2008个6 |
| ||
| 2008个3 |
=(
| ||
| 2008个6 |
| ||
| 2008个3 |
=1
| ||
| 2007个9 |
| ||
| 2008个9 |
=1
| ||
| 2007个9 |
| ||
| 2008个0 |
=1
| ||
| 2007个9 |
| ||
| 2008个0 |
| ||
| 2007个9 |
=1
| ||
| 2007个9 |
| ||
| 2007个0 |
答:
| ||
| 2008个6 |
| ||
| 2008个3 |
| ||
| 2007个9 |
| ||
| 2007个0 |
点评:考查了乘除法中的巧算,本题计算量较大,注意灵活运用运算定律简便计算.
练习册系列答案
相关题目