2999+999*999 简便

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2999+999*999 简便
2999+999*999 简便

2999+999*999 简便
2999+999*999
=2000+999+999*999
=2000+999*(999+1)
=2000+999000
=1001000

2000+999+999x999
=2000+999(1+999)
=2000+999000
=1001000

2999+999*999 =2000+999+(1000-1)999
=2000+999*1000=1001000

2999+999*999
=2000+999+999*999
=2000+999*(999+1)
=2000+999000
=1001000

=2000+999+999*999=2000+999*(999+1)=2000+999*1000=(2+999)*1000=1001*1000=1001000

3000-1+(1000-1)*(1000-1)=3000+1000*1000-1000-1000+1-1=1000000+1000=1001000

2999+999×999
=2999+999×(999+1-1)
=2999+999×(1000-1)
=2999+999×1000-999
=1001000