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简便计算1999+999×999

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

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

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

1999+999*999 =1000+999+999*999 =1000+999*(999+1) =1000*(999+1) =1000000 999*99*9 =(1000-1)*(100-1)*9 =1000*(100*9-9)-(100*9-9) =891000-891 =890109

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

采纳吧

解:如图

999*(999+1)-999+1999

999×(1999+1)=199800

=1000×1999-999 =1999000-999 =1998001

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