巧算助力简便计算让计算效率更高更准
999×778+666×333
=999×778+222×3×333
=999×778+222×999
=999×(778+222)
=999×1000
=999000
999×778+666×333
=999×778+222×3333
=999×(778+222)
=999×1000
=999000
999× 778+666×333=999×778+222×3×333=999×778+222×999=999×(778+222)=999×1000=999000