等比数列{Xn}满足lgXn-1=1+lgXn,若X1+X2+.+X100=100,则lg(X101+X102+.+x2
设数列{Xn}满足x1=10,lgXn+1=1+lgXn,求通项Xn.
已知an=lgXn,Xn=n/n+1
已知数列{xn}满足x1=2,x(n+1)=xn^3;设bn=lgxn,求数列{bn}的通项公式
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
设x1,x2,...,xn>0,(1)若1,x1,x2,...,xn,2成等差数列,则x1+x2+...+xn=____
已知,点pn (n,xn)在函数y=2^x的图像上设yn=lgxn+lg(n+1)/n
已知数列{xn}满足x1=3,x2=x1/2,...,xn=1/2(xn-1+xn-2),n=3,4,...,则xn等于
数列x1,x2...Xn.满足x=1/3 x( n+1)= xn^2+ xn 则1/(x1+1)+1/(x2+1)+.+
1,x1,x2,...xn,2 成等差数列,则x1+x2...+xn=?
不等式证明求解已知:正数x1,x2,x3……xn 满足x1+x2+x3+……+xn=1
设x1,x2,x3.xn都是正数,求证:x1^2/x2+x2^2/x2+.+xn-1^2/xn+xn^2/x1>=x1+
已知数列{xn}满足xn+1=xn-xn-1(n≥2),x1=a,x2=b,Sn=x1+x2+…+xn,则下面正确的是(