999×999+1999 999×222+333×334求巧算方法啊加急 (>__数学解答

999×999+1999 999×222+333×334
求巧算方法啊加急 (>_

人气：437 ℃　时间：2020-04-15 13:36:37

解答

999×999+1999
=999×(1000-1)+1999
=999×1000 -999+1999
=999000+1000
=1 000 000
999×222+333×334
=333x3x222+333x334
=333x(666+334)
=333x1000
=333 000