999X999巧算

2024-11-01 20:31:58
推荐回答(3个)
回答(1):

999X999
=999x(1000-1)
=999x1000-999
=999000-999
=998001

回答(2):

999X999巧算
=999X999+999-999
=999X(999+1)-999
=999X1000-999
=999000-999
=998001

回答(3):

999X999
=999X(1000一1)
=999Ⅹ1000一999X1
=999000一999
=998001