999*998+1998简便计算

问题描述:

999*998+1998简便计算

999000

999*998+1998
=(1000-1)*998+1998
=1000*998-998+1000+998
=998000+1000
=999000

999*998+1998
=(1000-1)*998+1998=1000*998-998+1000+998=998000+1000=999000

原式=1000*998-998+1998
=998000+1000
=999000

999*998+1998
=999(998+2)
=999000