观察下列式子:(x^2-1)/(x-1)=x+1,(x^3-1)/(x-1)=x^2+x+1,(x^4-1)/(x-1)
2个回答
1) (x^n-1)/(x-1) =x^n-1 + x^n-2 +……+x+1;
2) 1+2+2^2+……+2^62+2^63=(2^64-1)/(2-1)=2^64-1
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