Question

1999加999乘999的简便计算怎么做

Answer 1

1999+999×999
=1000+999+999×999
=1000+999×(1+999)
=1000+999×1000
=1000+999000
=1000000.
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Answer 2

1999+999×999
=1000+999+999×999
=1000+999×(1+999)
=1000+999×1000
=1000+999000
=1000000.

Answer 3

1999+999×999
=1000+999+999×999
=1000+999×（999+1）
=1000+999×1000
=1000×（999+1）
=1000×1000
=1000000

Answer 4

1999+999*999
=(2000-1)+(1000-1)*(1000-1)
=2000+1000*1000+1*1-2*1000*1-1
=2000+1000000+1-2000-1
=1000000

Answer 5

巧算助力简便计算让计算效率更高更准