题目内容
69×
+198×
+98×
.
| 198 |
| 199 |
| 81 |
| 199 |
| 99 |
| 199 |
69×
+198×
+98×
,
=69×
+81×
+49×
,
=(69+81+49)×
,
=199×
,
=198.
| 198 |
| 199 |
| 81 |
| 199 |
| 99 |
| 199 |
=69×
| 198 |
| 199 |
| 198 |
| 199 |
| 198 |
| 199 |
=(69+81+49)×
| 198 |
| 199 |
=199×
| 198 |
| 199 |
=198.
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