已知数列1/1x4,1/4x7,1/7x10……1/(3n-2)(3n+1),又因为有一个运算技巧1/a1a2+1/a2
已知数列1/1x4,1/4x7,1/7x10……1/(3n-2)(3n+1),又因为有一个运算技巧1/a1a2+1/a2
lim[1/(1x4)+1/(4x7)+1/(7x10)+...+1/(3n-2)x(3n+1)]=_____
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注:1x4、4x7、7x10等均为分母
1/1x4+1/4x7+1/7x10+……+1/2005x2008
1/1x4+1/4x7+1/7x10+……+1/97x100
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
是否存在常数C,使得等式1x4+2x7+3x10+.+n(3n+1)=n(n+c)(n+2c+1)对任意正整数n恒成立?
已知无穷数列1x2,2x3,3x4…,n(n+1),… 求:
已知数列{an}满足a1=1,a2=2,a3=3,a4=4,a5=5,当n≥5时,a(n+1)=a1a2……an-1,若
1/(1x4)+1/(4x7)+1/(7x10)+1/(10x13)简便运算 找规律 急
已知数列{an}是等比数列,a2=2,a5=6,则a1a2+a2a3+a3a4+...+ana(n+1)=