如题所述
è®°å¼å为f(x)=-ânx^(n+1)=-x^2ânx^(n-1)
æ f(x)/x^2=-ânx^(n-1)
积åå¾:g(x)=-âx^n=-x^2/(1-x)
æ±å¯¼å¾:f(x)/x^2=-(2x-x^2)/(1-x)^2
å æ¤æf(x)=x^3(x-2)/(1-x)^2
æ f(x)/x^2=-ânx^(n-1)
积åå¾:g(x)=-âx^n=-x^2/(1-x)
æ±å¯¼å¾:f(x)/x^2=-(2x-x^2)/(1-x)^2
å æ¤æf(x)=x^3(x-2)/(1-x)^2
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