数列加向量已知等差数列{an}的前n项和为Sn,若OB(向量)=a1×OA(向量)+a200×OC(向量),且A、B、C三点共线(该直线不过原点O)则S200等于 为什么他们三点共线a1+a200就是1了?
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![数列加向量已知等差数列{an}的前n项和为Sn,若OB(向量)=a1×OA(向量)+a200×OC(向量),且A、B、C三点共线(该直线不过原点O)则S200等于 为什么他们三点共线a1+a200就是1了?](/uploads/image/z/10923651-27-1.jpg?t=%E6%95%B0%E5%88%97%E5%8A%A0%E5%90%91%E9%87%8F%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E8%8B%A5OB%EF%BC%88%E5%90%91%E9%87%8F%EF%BC%89%3Da1%C3%97OA%28%E5%90%91%E9%87%8F%EF%BC%89%2Ba200%C3%97OC%EF%BC%88%E5%90%91%E9%87%8F%EF%BC%89%2C%E4%B8%94A%E3%80%81B%E3%80%81C%E4%B8%89%E7%82%B9%E5%85%B1%E7%BA%BF%EF%BC%88%E8%AF%A5%E7%9B%B4%E7%BA%BF%E4%B8%8D%E8%BF%87%E5%8E%9F%E7%82%B9O%EF%BC%89%E5%88%99S200%E7%AD%89%E4%BA%8E+%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BB%96%E4%BB%AC%E4%B8%89%E7%82%B9%E5%85%B1%E7%BA%BFa1%2Ba200%E5%B0%B1%E6%98%AF1%E4%BA%86%3F)
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