数列an各项为正数,前n项和为sn.sn=na+n(n-1)b求证an为等差数列求证pn(an,(sn/n)-1)都落在同一直线上若a=1,b=½,且p1,p2,p3三点都在以(r,r)为圆心,r为半径的圆外,求r取值范围!
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![数列an各项为正数,前n项和为sn.sn=na+n(n-1)b求证an为等差数列求证pn(an,(sn/n)-1)都落在同一直线上若a=1,b=½,且p1,p2,p3三点都在以(r,r)为圆心,r为半径的圆外,求r取值范围!](/uploads/image/z/7233320-56-0.jpg?t=%E6%95%B0%E5%88%97an%E5%90%84%E9%A1%B9%E4%B8%BA%E6%AD%A3%E6%95%B0%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAsn.sn%3Dna%2Bn%28n-1%29b%E6%B1%82%E8%AF%81an%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E6%B1%82%E8%AF%81pn%EF%BC%88an%2C%28sn%2Fn%29-1%29%E9%83%BD%E8%90%BD%E5%9C%A8%E5%90%8C%E4%B8%80%E7%9B%B4%E7%BA%BF%E4%B8%8A%E8%8B%A5a%3D1%EF%BC%8Cb%3D%26%23189%3B%EF%BC%8C%E4%B8%94p1%EF%BC%8Cp2%EF%BC%8Cp3%E4%B8%89%E7%82%B9%E9%83%BD%E5%9C%A8%E4%BB%A5%EF%BC%88r%EF%BC%8Cr%EF%BC%89%E4%B8%BA%E5%9C%86%E5%BF%83%EF%BC%8Cr%E4%B8%BA%E5%8D%8A%E5%BE%84%E7%9A%84%E5%9C%86%E5%A4%96%EF%BC%8C%E6%B1%82r%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%81)
数列an各项为正数,前n项和为sn.sn=na+n(n-1)b求证an为等差数列求证pn(an,(sn/n)-1)都落在同一直线上若a=1,b=½,且p1,p2,p3三点都在以(r,r)为圆心,r为半径的圆外,求r取值范围!
数列an各项为正数,前n项和为sn.sn=na+n(n-1)b求证an为等差数列
求证pn(an,(sn/n)-1)都落在同一直线上
若a=1,b=½,且p1,p2,p3三点都在以(r,r)为圆心,r为半径的圆外,求r取值范围!
数列an各项为正数,前n项和为sn.sn=na+n(n-1)b求证an为等差数列求证pn(an,(sn/n)-1)都落在同一直线上若a=1,b=½,且p1,p2,p3三点都在以(r,r)为圆心,r为半径的圆外,求r取值范围!