高中数列加试题求所有正整数A1,A2...An,使得(99/100)=(A0/A1)+(A1/A2)+...+(An-1/An),其中A0=1,[A(k+1)-1]*A(k-1)>=A(k)*A(k)*[A(k)-1],k=1,2,...n
问题描述:
高中数列加试题
求所有正整数A1,A2...An,使得(99/100)=(A0/A1)+(A1/A2)+...+(An-1/An),其中A0=1,[A(k+1)-1]*A(k-1)>=A(k)*A(k)*[A(k)-1],k=1,2,...n
答
[A(k+1)-1]*A(k-1)>=A(k)*A(k)*[A(k)-1] (a2-1)*a0=a1^2(a1-1) a0/a1=a1(a1-1)/(a2-1)=a1a2(a1-1)/a2(a2-1)=(a1/a2)*[a2(a1-1)/(a2-1)] a1/a2=(a0/a1)*(a2-1)/a2(a1-1) a2/a3=(a1/a2)*(a3-1)/a3(a2-1)=(a0/a1)*(a3-1...