99999x99999=?
=
這條數快捷的方法是什麼
2010-11-21 6:10 am
回答 (3)
2010-11-21 8:47 am
✔ 最佳答案
99999x99999=100000x99999-99999=9999900000-99999=999980001
2010-11-21 9:38 am
幫 eagles 補充一下：
99999 x 99999
= 99999 x (100000 - 1)
= 9999900000 - 99999
= 9999900000 - 100000 + 1
= 9999800001
99999 x 99999
= 99999 x (100000 - 1)
= 9999900000 - 99999
= 9999900000 - 100000 + 1
= 9999800001
2010-11-21 6:35 am
99999x99999
=(1000000-1)^2
=1000000^2-2x1000000+1
=999999000001
2010-11-20 22:37:59 補充：
上方為錯誤答案
-------------------------------
以下為正確答案
9999x99999
=(100000-1)^2
=100000^2-2x100000+1
=99999800001
參考: WingGordon, WingGordon,BlaZe HaZe
收錄日期: 2021-04-13 17:39:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101120000051KK01616