1999+999x999用简便方法计算!!

2024-11-08 16:32:16
推荐回答(3个)
回答1:

1999+999*999
=1000+999+999*999
=1000+999*(999+1)
=1000*(999+1)
=1000000

999*99*9
=(1000-1)*(100-1)*9
=1000*(100*9-9)-(100*9-9)
=891000-891
=890109

回答2:

您好!

1999+999*999
=(1000+999)+999*999
=1000+999*(999+1)
=1000+999*1000
=1000+999000
=1000000

回答3:

你是一个大笨蛋