题目内容
用简便方法计算下面各题.
(1)
×41
(2)2011×
.
(1)
54 |
55 |
(2)2011×
19 |
2010 |
(1)
54 |
55 |
=(1-
1 |
55 |
=1×41-
1 |
55 |
=41-
41 |
55 |
=40
14 |
55 |
(2)2011×
19 |
2010 |
=(2010+1)×
19 |
2010 |
=2010×
19 |
2010 |
19 |
2010 |
=19+
19 |
2010 |
=19
19 |
2010 |
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