题目内容
2008
|
|
（3）2668
×
=（2668+
）×
=2668×
+
×
=3+
=3
；
（2）
+
+
+…+
=
×（
-
+
-
+…+
-
）
=
×（
-
）
=
×
=
．
| 2668 |
| 2669 |
| 3 |
| 2668 |
=（2668+
| 2668 |
| 2669 |
| 3 |
| 2668 |
=2668×
| 3 |
| 2668 |
| 2668 |
| 2669 |
| 3 |
| 2668 |
=3+
| 3 |
| 2669 |
=3
| 3 |
| 2669 |
（2）
| 3 |
| 7×9 |
| 3 |
| 9×33 |
| 3 |
| 33×33 |
| 3 |
| 39×23 |
=
| 3 |
| 2 |
| 3 |
| 7 |
| 3 |
| 9 |
| 3 |
| 9 |
| 3 |
| 33 |
| 3 |
| 39 |
| 3 |
| 23 |
=
| 3 |
| 2 |
| 3 |
| 7 |
| 3 |
| 23 |
=
| 3 |
| 2 |
| 2 |
| 23 |
=
| 3 |
| 23 |
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