666乘333加778乘999(简算)一定要简算

问题描述:

666乘333加778乘999(简算)
一定要简算

666*333+778*999
=3*222*333+778*999
=222*999+778*999
=(222+778)*999
=1000*999
=999000

=222×3×333+778×999
=222×999+778×999
=(222+778)×999
=1000×999
=999000