666*778+333*444 (巧算)
问题描述:
666*778+333*444 (巧算)
答
666*778+333*444
=666×778+666×222
=666×(778+222)
=666×1000
=6660001999+999*999(巧算)1999+999*999=1000+999×(1+999)=1000+999000=1000000