求问几道高一必修5的题啊 急用!1.设{an}是公差为-2的等差数列,且a1+a4+a7+……+a97=50,求a3+a6+a9+……+a99 2.Sn是等差数列{an}的前n项和,若S9/S6=1/3,求S6/S123.在等差数列{an}中,a2+a7+a12=24,求S13
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![求问几道高一必修5的题啊 急用!1.设{an}是公差为-2的等差数列,且a1+a4+a7+……+a97=50,求a3+a6+a9+……+a99 2.Sn是等差数列{an}的前n项和,若S9/S6=1/3,求S6/S123.在等差数列{an}中,a2+a7+a12=24,求S13](/uploads/image/z/10359218-2-8.jpg?t=%E6%B1%82%E9%97%AE%E5%87%A0%E9%81%93%E9%AB%98%E4%B8%80%E5%BF%85%E4%BF%AE5%E7%9A%84%E9%A2%98%E5%95%8A+%E6%80%A5%E7%94%A8%211.%E8%AE%BE%EF%BD%9Ban%EF%BD%9D%E6%98%AF%E5%85%AC%E5%B7%AE%E4%B8%BA-2%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E4%B8%94a1%2Ba4%2Ba7%2B%E2%80%A6%E2%80%A6%2Ba97%3D50%2C%E6%B1%82a3%2Ba6%2Ba9%2B%E2%80%A6%E2%80%A6%2Ba99+2.Sn%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2C%E8%8B%A5S9%2FS6%3D1%2F3%2C%E6%B1%82S6%2FS123.%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E4%B8%AD%2Ca2%2Ba7%2Ba12%3D24%2C%E6%B1%82S13)
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