题目内容
用自己喜欢的方法计算.
×
+
×
×11+
46×
.
|
| 5 |
| 7 |
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 7 |
| 3 |
| 4 |
| 3 |
| 4 |
| 44 |
| 45 |
分析:(1)(2)(3)运用乘法分配律简算;
(4)把46看作45=1,运用乘法分配律简算.
(4)把46看作45=1,运用乘法分配律简算.
解答:解:(1)(
+
)×24,
=
×24+
×24,
=2+6,
=8;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)
×11+
,
=
×(11+1),
=
×12,
=9;
(4)46×
,
=(45+1)×
,
=45×
+1×
,
=44+
,
=44
.
| 1 |
| 12 |
| 1 |
| 4 |
=
| 1 |
| 12 |
| 1 |
| 4 |
=2+6,
=8;
(2)
| 5 |
| 7 |
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 7 |
| 9 |
| 2 |
| 9 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
(3)
| 3 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=9;
(4)46×
| 44 |
| 45 |
=(45+1)×
| 44 |
| 45 |
=45×
| 44 |
| 45 |
| 44 |
| 45 |
=44+
| 44 |
| 45 |
=44
| 44 |
| 45 |
点评:此题主要考查了运用乘法分配律进行简便计算.
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