题目内容
简便计算．
×
+
×
86×
．
| 1 |
| 3 |
| 5 |
| 12 |
| 1 |
| 4 |
| 1 |
| 3 |
| 3 |
| 85 |
①
×
+
×
=
×（
+
）
=
×
=
；
②86×
=（85+1）×
=85×
+1×
=3+
=3
．
| 1 |
| 3 |
| 5 |
| 12 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 3 |
| 5 |
| 12 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 2 |
| 3 |
=
| 2 |
| 9 |
②86×
| 3 |
| 85 |
=（85+1）×
| 3 |
| 85 |
=85×
| 3 |
| 85 |
| 3 |
| 85 |
=3+
| 3 |
| 85 |
=3
| 3 |
| 85 |
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