1999+999×999、360×26+260×64怎么简便运算?

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1999+999×999、360×26+260×64怎么简便运算?
1999+999×999、360×26+260×64怎么简便运算?

1999+999×999、360×26+260×64怎么简便运算?
1. 1999+999×999
=1000+999+999×999
=1000+999×(999+1)
=1000+999×1000
=(999+1)×1000
=1000×1000
=1000000
2. 360×26+260×64
=36×260+260×64
=260×(36+64)
=260×100
=26000

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