观察下列各式:
(x-1)(x+1)=x2-1
(x-1)(x2+x+1)=x3-1
(x-1)(x3+x2+x+1)=x4-1
根据前面各式的规律,猜想
(x-1)(x2016+x2015+x2014+…+x+1)= x2017-1 .
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