题目内容
用简便方法计算：
3
×
+
×3
12×2
（
+
）×27．
3
| 5 |
| 12 |
| 4 |
| 9 |
| 5 |
| 9 |
| 5 |
| 12 |
12×2
| 3 |
| 4 |
（
| 2 |
| 9 |
| 2 |
| 27 |
①3
×
+
×3
=3
×（
+
）
=3
×1
=3
；
②12×2
=12×
=33；
③（
+
）×27
=
×27+
×27
=6+2
=8．
| 5 |
| 12 |
| 4 |
| 9 |
| 5 |
| 9 |
| 5 |
| 12 |
=3
| 5 |
| 12 |
| 4 |
| 9 |
| 5 |
| 9 |
=3
| 5 |
| 12 |
=3
| 5 |
| 12 |
②12×2
| 3 |
| 4 |
=12×
| 11 |
| 4 |
=33；
③（
| 2 |
| 9 |
| 2 |
| 27 |
=
| 2 |
| 9 |
| 2 |
| 27 |
=6+2
=8．
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