题目内容
怎样算简便怎样算.
|
|
分析:(1)运用乘法分配律解答,
(2)化
=1×
,再运用乘法分配律解答.
(2)化
| 2 |
| 15 |
| 2 |
| 15 |
解答:解:(1)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)
+
×
,
=1×
+
×
,
=
×(1+
),
=
×
,
=
.
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(2)
| 2 |
| 15 |
| 2 |
| 3 |
| 2 |
| 15 |
=1×
| 2 |
| 15 |
| 2 |
| 3 |
| 2 |
| 15 |
=
| 2 |
| 15 |
| 2 |
| 3 |
=
| 2 |
| 15 |
| 5 |
| 3 |
=
| 2 |
| 9 |
点评:本题主要考查学生运用乘法分配律解决问题的能力.
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