666x333+778x999合适的方法计算
666x333+778x999
=(222x3)x333+778x999
=222x(3x333)+778x999
=222x999+778x999
=999x(222+778)
=999x1000
=999000
666x333+778x999
=(222x3)x333+778x999
=222x(3x333)+778x999
=222x999+778x999
=999x(222+778)
=999x1000
=999000