简算999×997-998×996
问题描述:
简算999×997-998×996
答
999×997-998×996=(998+1)×(996+1)-998×996=998×996+998+996+1-998×996=1995
答
1995
答
999×997-998×996
=(998+1)×(996+1)-998×996
=998×996+998+996+1-998×996
=998+996+1
=998+997
=1995
答
999×997-998×996=(998+1)×997-998×996=998×997+997-998×996
=998×(997-996)+997=998+997=1995