观察下列各式:(x-1)(x+1)=x 2 -1  ...
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…根据前面规律可得(x-1)(xn+1+xn+…...
观察下列各式:(x-1)(x+1)=x 2 -1 (x-1)(x 2 +x+1)=x 3 -1(x-1)(x 3 +x 2 +x+1)=x 4 -1…根据前面规律可得 (x-1)(x n+1 +x n +…+x+1)=______.
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