题目内容
能简算的要简算:
|
2011×
|
|
|
分析:本组题目(1)、(2)、(3)、(4)、都运用乘法的分配律进行计算,这样使计算更加简便,
解答:解:(1)
÷5+
÷8,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)2011×
,
=(2010+1)×
,
=2010×
+
,
=2009
;
(3)
×15÷
×15,
=
×15×
×15,
=225;
(4)
×22+
,
=
×(22+1),
=
×23,
=7.
| 7 |
| 8 |
| 1 |
| 5 |
=
| 7 |
| 8 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 8 |
=
| 1 |
| 5 |
| 7 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 5 |
=
| 1 |
| 5 |
(2)2011×
| 2009 |
| 2010 |
=(2010+1)×
| 2009 |
| 2010 |
=2010×
| 2009 |
| 2010 |
| 2009 |
| 2010 |
=2009
| 2009 |
| 2010 |
(3)
| 7 |
| 15 |
| 7 |
| 15 |
=
| 7 |
| 15 |
| 15 |
| 7 |
=225;
(4)
| 7 |
| 23 |
| 7 |
| 23 |
=
| 7 |
| 23 |
=
| 7 |
| 23 |
=7.
点评:本题主要考查了学生乘法分配律的应用情况,运用定律使我们的计算更加简便.
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