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简便计算1999+999×999

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

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

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

99x999+199 =99x(1000-1)+199 =99x1000-99+199 =99100 希望我的回答能帮助你, 如有帮助请采纳

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+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

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1999+999*999 =1000+999+999*999=1000+999*(999+1)=1000*(999+1)=1000000 希望能帮到你,请采纳正确答案,点击【采纳答案】,谢谢 ^_^

=999乘(1999+1) =1998000

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