1,当n=2时
a2=1+1/4=5/4
b2=2-1/2=3/2=6/4
所以a2<b2成立;
2,当n>2时
an=1+1/2²+1/3²+。。。+1/n²
a(n+1)=1+1/2²+1/3²+。。。+1/(n+1)²
a(n+1)-an=1/(n+1)²
b...
1,当n=2时
a2=1+1/4=5/4
b2=2-1/2=3/2=6/4
所以a2<b2成立;
2,当n>2时
an=1+1/2²+1/3²+。。。+1/n²
a(n+1)=1+1/2²+1/3²+。。。+1/(n+1)²
a(n+1)-an=1/(n+1)²
b...