(1/2)已知等差数列{an}中,a3+a4=15,a2*a5=54,公差d
人气：108 ℃ 时间：2019-08-19 22:10:11
解答
等差数列中,有a3＋a4=a2＋a5,则：a2＋a5=15,a2*a5=54,得：a2=9,a5=6.又：a5－a2=3d,得：d=－1.通项公式：an=11－n
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