分析:(1)利用等差数列的性质可得 a2+a5=a3+a4=22a3•a4 =117 ,联立方程可得a3,a4,代入等差数列的通项公式可求an(2)代入等差数列的前n和公式可求sn,进一步可得bn,然后结合等差数列的定义可得2b2=b1+b3,从...
已知公差大于0的等差数列{an}的前n项和为Sn,且a2+a5=22,a3*a4=117
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