题目内容
2
×
+
×
+
×
.
| 1 |
| 2 |
| 4 |
| 15 |
| 1 |
| 3 |
| 5 |
| 2 |
| 2 |
| 5 |
| 5 |
| 2 |
分析:2
=
,然后再根据乘法分配律进行简算.
| 1 |
| 2 |
| 5 |
| 2 |
解答:解:2
×
+
×
+
×
,
=
×
+
×
+
×
,
=
×(
+
+
),
=
×1,
=
.
| 1 |
| 2 |
| 4 |
| 15 |
| 1 |
| 3 |
| 5 |
| 2 |
| 2 |
| 5 |
| 5 |
| 2 |
=
| 5 |
| 2 |
| 4 |
| 15 |
| 1 |
| 3 |
| 5 |
| 2 |
| 2 |
| 5 |
| 5 |
| 2 |
=
| 5 |
| 2 |
| 4 |
| 15 |
| 1 |
| 3 |
| 2 |
| 5 |
=
| 5 |
| 2 |
=
| 5 |
| 2 |
点评:此题主要考查了乘法分配律的灵活运用,然后再进一步计算.
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