Question

(1)已知等差數(shù)列{a_n}的公差為d(d≠0)，且a₃＋a₆＋a₁₀＋a₁₃＝32.若a_m＝8，則m＝________．
(2)設(shè)等差數(shù)列{a_n}的前n項(xiàng)和為S_n，若S₃＝9，S₆＝36，則a₇＋a₈＋a₉＝________．

Answer 1

(1)8(2)45

解析