问题
解答题
69×
|
答案
69×
+198×198 199
+98×81 199
,99 199
=69×
+81×198 199
+49×198 199
,198 199
=(69+81+49)×
,198 199
=199×
,198 199
=198.
69×
|
69×
+198×198 199
+98×81 199
,99 199
=69×
+81×198 199
+49×198 199
,198 199
=(69+81+49)×
,198 199
=199×
,198 199
=198.