数列{an}是公差不为0的等差数列,且a1,a3,a7为等比数列{bn}的连续三项,若b1=1,则b2005=_____
设正项数列{an}是公差不为零的等差数列,正项数列{bn}是等比数列,且a1=b1,a3=b3,a7=b5
1.数列{an}是公差不为0的等差数列,且a7,a10,a15是一等比数列{bn}的连续三项,若该等比数列的首项b1=3
数列{an}是公差不为零的等差数列,{bn}是等比数列,且a1=b1=1,a3=b3,a7=b5,求数列{an}与{bn
公差不为零的等差数列{an}中,有2a3-a7²+2a11=0,数列{bn}是等比数列,且b7=a7,则b6b
设等差数列{an}的公差d≠0,数列{bn}为等比数列,若a1=b1=a,a3=b3,a7=b5
等差数列{an}的公差d≠0,数列{bn}是等比数列,若a1=b1,a3=b3,a7=b5,则b11=( )
在公差不为0的等差数列an中,有2a3-a7²+2a11=0,数列bn是等比数列,且b7=a7
设等差数列{an}的公差d≠0,数列{bn}为等比数列,若a1=b1,b2=a3 b3=a2,则bn的公比为
已知等差数列{an}公差为d,满足a1+a2+a3=15,且a1+1,a3+1,a7+1构成等你数列的连续三项
设(an)为等差数列,其公差0不等於d.已知a1,a3和a7为一等比数列中的连续三项,且a1+a3+a7=70.
已知等差数列an的公差不为零,且a3=5,a1,a2,a5成等比数列.数列bn满足b1+2b2+4
已知数列[an]为等差数列,公差d≠0;[bn]为等比数列,公比为q,若a1=b1,a3=b3,a7=b5,且an=bm