已知等差数列｛an｝满足：a1+a2+a3+…+a101＝0,则使前n项和Sn取得最大值的n值为A.50B.51C.50或51D.51或52

已知等差数列{an}满足a1+a2+a3+...+a11=0,则有A、a1+a11>0B、a2+a10 已知等差数列｛an｝满足a1+a2+a3+……+a99＝0则( ) A.a1+a99>0 B.a已知等差数列｛an｝满足a1+a2+a3+……+a99＝0则( )A.a1+a99>0 B.a1+a99 已知等差数列(an)满足a1=2,且a1,a2,a5成等比数列 已知等差数列{an}满足a1+a2+a3+……+a101=0,则有（）A.a1+a101>0 B.a2+a100 已知数列{an}满足a1+a/4,(1-an)a(n+1)=1/4,令bn+an-1/2 求证数列{1/bn}为等差数列,求和:Sn=a2/a1+a3/a2+...+a(n+1)/an已知数列{an}满足a1=1/4,(1-an)(a(n+1))=1/4,令bn=an-1/2 求证数列{1/bn}为等差数列，求和:Sn=a2/a1+a3/a2+... 已知递增的等差数列{An}满足A1=1且A1,A2,A5成等比数列.(1)求等差数列{An}的通项An 1.已知递增的等差数列{an}满足a1=1,a3=a2^2-4,则an=? 已知递增的等差数列(AN)满足A1＝1.A3＝A2的平方-4.则AN＝ 已知an为等差数列,且a1+a2+...+a100=A,an-99+an-98+...+an=B 已知数列{an}和{bn}满足关系:bn=(a1+a2+a3+…+an)/n,(n∈N*).若{bn}是等差数列,求证{an}为等差数列 (1)已知等差数列｛an｝,满足a1+a2+…+a101＝0,则有A.a1+a101>0 B.a1+a1010(2)设Sn是数列｛an｝的前n项和,且Sn＝n^2,则｛an｝A.等比数列,但不是等差数列B.等差数列,但不是等比数列C.等差数列,而且也是等比 等差数列{an}满足a1=1,且a1、a2、a4成等比数列,求an 已知数列{an}有a1=a,a2=p(常数p>0),对任意的正整数n,Sn=a1+a2+...已知数列{an}有a1=a,a2=p(常数p>0),对任意的正整数n,Sn=a1+a2+...+an,并有Sn满足Sn=n(an-a1)/2 （1）求a的值.（2）是确定数列{an}是否为等差数列 已知an为等差数列,且a2=-8,若等差数列bn满足b1=-8,b2=a1+a2+a3,求bn的前n项和Tn. 已知{an}为等差数列,且a2=-8,若等差数列{bn}满足b1=-8,b2=a1+a2+a3,求{bn】的前项和Tn 已知等差数列{an}满足a1+a2+a3+…+a101=0,则有( ) A.a1+a101＞0 B.a2+a100＜0 C.a3+a99=0 D.a51=51 已知等差数列{an}满足a1+a2+a3+…+a101=0,则有( ) A.a1+a101＞0 B.a2+a100＜0 C.a3+a99=0 D.a51=51 已知等差数列{an}满足a1+a2+a3+a4+.+a101=0,则有a51=0为什么?