题目内容
用简便方法计算:
|
54×
|
分析:(1)运用乘法分配律简算;
(2)把54看作53+1,运用乘法分配律简算.
(2)把54看作53+1,运用乘法分配律简算.
解答:解:(1)
×
-
×
,
=
×(
-
),
=
×1,
=
;
(2)54×
,
=(53+1)×
,
=53×
+1×
,
=50+
,
=50
.
| 18 |
| 11 |
| 1 |
| 16 |
| 1 |
| 16 |
| 7 |
| 11 |
=
| 1 |
| 16 |
| 8 |
| 11 |
| 7 |
| 11 |
=
| 1 |
| 16 |
=
| 1 |
| 16 |
(2)54×
| 50 |
| 53 |
=(53+1)×
| 50 |
| 53 |
=53×
| 50 |
| 53 |
| 50 |
| 53 |
=50+
| 50 |
| 53 |
=50
| 50 |
| 53 |
点评:此题重在考查学生对乘法分配律的掌握与运用情况.
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