题:已知正项数列{An}中,A1=1,2An²=An+1²+An-1²,n≥2,求A6

问题描述:

题:已知正项数列{An}中,A1=1,2An²=An+1²+An-1²,n≥2,求A6

2An²=An+1²+An-1²化简:An²=An得出A6=1