已知数列{an}满足:a1=1,a2=1/2,且[3+(-1)n]an+2-2an+2[(-1)n-1]=0,n属于N*
已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an
已知数列{an}满足a1=1,a1+a2+a3+.+a(n-1)-an=-1(n≥2且n属于N+).
已知数列{an}中,a1=1,满足an+1=an+2n,n属于N*,则an等于
已知数列{An}满足A1=0.5,A1+A2+…+An=n^2An(n∈N*),试用数学归纳法证明:An=1/n(n+1
已知数列{an}满足a1=1,a2=2,an+2=an+an+12,n∈N*.
已知数列an满足1/a1+2/a2+……+n/an=3/8(3∧2n-1),n属于正整数1.求an
数列{an}中a1=3,an+an-1+2n-1=0(n属于N且n>=2)(1)求a2,a3的值
已知数列{an}满足a1=1,an=(an-1)/3an-1+1,(n>=2,n属于N*),求数列{an}的通项公式
已知数列{an}满足a0=1,an=a0+a1+a2+...+a(n-1) (n≥2且n属于N*),则当n属于N*时an
已知数列(an)满足a1+2a2+3a3+...+nan=n(n+1)(n+2)求an
已知数列{an}中a1=6,且an-an-1=(an-1/n)+n+1(n属于N*,n≥2),求an
数列{an}满足:1/a1+2/a2+3/a3+…+n/an=2n