Question

999x999十1999的简便计算怎么做

Answer 1

999x999+1999
=999x999+999+1000
=999x（999+1）+1000
=999ⅹ1000+1000
=999000+1000
=1000000

Answer 2

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