(1+1/x+1/x^2+...+1/x^n)+(1+1/y+1/y^2+...+1/y^n)
=[1-1/x^(n+1)]/(1-1/x)+[1-1/y^(n+1)]/(1-1/y)
分组求和求和 2+(x+y)/xy+(x^2+y^2)/x2y2+(x^3+y^3)/x^3y^3+.+(x^n+y^n
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