急~~~高二数学题~~~麻烦指教~~~~请给出大致解题思路,谢谢!1.在等比数列{An}中,a5+a6=a,(a不为0),a15+a16=b,则a25+a26的值是______2.Sn是等差数列{An}的前n项和,若a2+a4+a15是一个确定的常数,则在数列{Sn}中也

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