A1>0,A1≠1,An+1=2An/1+An(n=1,2..)求证An+1≠An(1)求证An+1≠An(2)令A1=1/2,求An的通项公式

A1>0,A1≠1,An+1=2An/1+An(n=1,2..)求证An+1≠An(1)求证An+1≠An(2)令A1=1/2,求An的通项公式 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 已知数列{an}中,a1=1/2,an+1+3an=0,an=( ) 在数列an中,a1=0,an+1=2an+2,求an 在等差数列an中,a1=2,3an+1-an=0,求an 数列{an}中,2an*an+1+2an+1-an=0,a1=1,an=? 数列｛an｝中,a1=1/2 3an*an-1+an-an-1=0,通项公式an 已知a1=2,an不等于0,且an+1-an=2an+1an,求an 已知a1+a2+…….+an=1求证：a1^2/(a1+a2) + a2^2/(a2+a3)…….+an-1^2/(an-1+an) +an^2/(an+a1)>1/2已知a1+a2+…….+an=1求证：a1^2/(a1+a2) + a2^2/(a2+a3)……+an-1^2/(an-1+an) +an^2/(an+a1)>1/2 an=a1+(n-1)d 和Sn=n(a1+an)/2中an是什么意思? an=a1+(n-1)d 和Sn=n(a1+an)/2中an是什么 数列an中,a1=3,an+1=an/2an+1,则an=? 设a1,a2,...,an都是正数,证明不等式(a1+a2+...+an)[1/(a1)+1/(a2)+...+1/(an)]>=n^2 如果a1+a2+...+an=1(0 已知数列an满足a1=1,1/an+1=根号1/an^2+2,an>0,求an 数列{an}满足:a1=1,an>0,an+1^2-an^2=1,那么an 数列{an}满足:a1=1,an>0,an+1^2-an^2=1,那么an 已知数列｛an｝满足a1=1,an+1 -an+2an+1•an=0求通项