题目内容
简算下面各题:
(1)
×199-
(2)24×( .
(1)
| 5 |
| 9 |
| 5 |
| 9 |
(2)24×( .
分析:(1)运用乘法分配律简算;
(2)用乘法分配律简算.
(2)用乘法分配律简算.
解答:解:(1)
×199-
,
=
×(199-1),
=
×198,
=110;
(2)24×( ,
=24×
+24×
-24×
,
=18+20-
,
=38-
,
=37
.
| 5 |
| 9 |
| 5 |
| 9 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
=110;
(2)24×( ,
=24×
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 32 |
=18+20-
| 3 |
| 4 |
=38-
| 3 |
| 4 |
=37
| 1 |
| 4 |
点评:乘法分配律是常用的简便运算的方法,要熟练掌握,灵活运用.
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