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简便计算1999+999×999

=(1000-1)²+2000-1 =1000000-2×1000+1+2000-1 =1000000

简便计算 999×999+1999 =999×999+999+1000 =999×(999+1)+1000 =999×1000+1000 =999000+1000 =100000

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

采纳吧

解:根据拆分法和提取公因式的简便方法, 原式=999x999+999+1000 =999x(999+1)+1000 =999x1000+1000 =1000x(999+1) =1000x1000 =1000000

1999+999x999 =1000+999+999x999 =1000+999x(1+999) =1000+999x1000 =1000x(1+999) =1000x1000 =1000000

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

=1000×1999-999 =1999000-999 =1998001

简便计算还是图的问题 1999x999x999 =(2000-1)(1000-1)(1000-1) =(2000000-3000+1)(1000-1) =2000000000-5000000+4000-1 =2000003999-5000000 =1995003999 (1000+999)×999×999 =1000×999×999+999×999×999 =1000×(1000-1)×(1000-1)+(...

就这样

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