题目内容
| 5 |
| 7 |
| 4 |
| 9 |
分析:17=18-1,然后再根据乘法分配律进行简算.
解答:解:
+
×17,
=
+
×(18-1),
=
+
×18-
×1,
=
+8-
,
=8
-
,
=8
.
| 5 |
| 7 |
| 4 |
| 9 |
=
| 5 |
| 7 |
| 4 |
| 9 |
=
| 5 |
| 7 |
| 4 |
| 9 |
| 4 |
| 9 |
=
| 5 |
| 7 |
| 4 |
| 9 |
=8
| 5 |
| 7 |
| 4 |
| 9 |
=8
| 17 |
| 63 |
点评:此题主要考查了乘法分配律的灵活运用,注意根据实际情况把一个因数看作两个数的和或差来简算.
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