這題用分配律怎算，分配律公式。
回答 (3)
2013-05-23 5:35 am
✔ 最佳答案
20052006 x 20062005 - 20052005 x 20062006= (20052005 + 1) x 20062005 - 20052005 x 20062006
= 20052005 x 20062005 + 20062005 - 20052005 x 20062006
= (20052005 x 20062005 - 20052005 x 20062006) + 20062005
= 20052005 x (20062005 - 20062006) + 20062005
= 20052005 x (-1) + 20062005
= -20052005 + 20062005
= 10000
參考: andrew
2013-05-23 5:51 am
令20052005=x, 20062006=y
20052006*20062005-20052005*20062006
=(x+1)(y-1)-xy
=xy-x+y-1-xy
=-x+y-1
=-20052005+20062006-1
=10000
20052006*20062005-20052005*20062006
=(x+1)(y-1)-xy
=xy-x+y-1-xy
=-x+y-1
=-20052005+20062006-1
=10000
2013-05-23 5:43 am
20052006*20062005-20052005*20062006
=(20052005+1)*20062005-20052005*(20062005+1)
=20052005*20062005+20062005-20052005*20062005
=20062005-20052005
=10000
=(20052005+1)*20062005-20052005*(20062005+1)
=20052005*20062005+20062005-20052005*20062005
=20062005-20052005
=10000
收錄日期: 2021-04-13 19:29:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130522000016KK05039