题目内容
计算．
×13-13×25%
75%×
+
×
×
+62.5%×
．
| 3 |
| 4 |
75%×
| 5 |
| 17 |
| 5 |
| 17 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 7 |
| 1 |
| 7 |
分析：这三个题目都可以根据乘法分配律简算．
解答：解：（1）
×13-13×25%
=（
-
）×13
=
×13
=
；
（2）75%×
+
×
=
×（
+
）
=
×1
=
；
（3）
×
+62.5%×
=（
+
）×
=1×
=
．
| 3 |
| 4 |
=（
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 2 |
=
| 13 |
| 2 |
（2）75%×
| 5 |
| 17 |
| 5 |
| 17 |
| 1 |
| 4 |
=
| 5 |
| 17 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 17 |
=
| 5 |
| 17 |
（3）
| 3 |
| 8 |
| 1 |
| 7 |
| 1 |
| 7 |
=（
| 3 |
| 8 |
| 5 |
| 8 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
点评：完成本题要注意分析式中数据，运用合适的简便方法计算．
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