999×999＋998×998＝?

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/14 04:51:44

999×999＋998×998＝?
hadfi

999*999+998*998 = 1 994 005
(1000-1)^2 + (1000-2)^2
= 1000000 - 2000 +1 +1000000 -4000 +4
=1994005

999×999＋998×998＝? 998/999×998 998/999*998 999*999+1000*998 -999 * -998 * -997*.*997*998*999=? 999*999-1002*998=( ) 999*998/997*499 999^2-1002*998 (999+997/998)*499 999乘999分之998乘999 999又999分之998乘以999 已知a=-[(999*999-999)/(998*998+998)],b=-[(1000*1000-1000)/(999