333x334+222x999=333x334+222x3x333=333x334+666x333=333x（334+666）=333x1000=333000
=333*334+222*999=333*334+222*3*333=333*334+666*333=333*（334+666）=333*1000=333000
巧算助力简便计算让计算效率更高更准
