1999+999×999、360×26+260×64怎么简便运算?
问题描述:
1999+999×999、360×26+260×64怎么简便运算?
答
1999+999×999
=1000+999+999×999
=1000+999×(1+999)
=1000+999×1000
=1000+999000
=1000000
360×26+260×64
=36×260+260×64
=260×(36+64)
=260×100
=26000
答
1. 1999+999×999=1000+999+999×999=1000+999×(999+1)=1000+999×1000=(999+1)×1000=1000×1000=10000002. 360×26+260×64=36×260+260×64=260×(36+64)=260×100=26000