题目内容
用简便方法计算：
24×
×
×21 17×
+17÷
．
24×
| 2 |
| 7 |
| 5 |
| 72 |
| 11 |
| 23 |
| 23 |
| 12 |
①24×
×
×21
=（24×
）×（
×21）
=
×6
=10；
②17×
+17÷
=17×
+17×
=17×（
+
）
=17×1
=17．
| 2 |
| 7 |
| 5 |
| 72 |
=（24×
| 5 |
| 72 |
| 2 |
| 7 |
=
| 5 |
| 3 |
=10；
②17×
| 11 |
| 23 |
| 23 |
| 12 |
=17×
| 11 |
| 23 |
| 12 |
| 23 |
=17×（
| 11 |
| 23 |
| 12 |
| 23 |
=17×1
=17．
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