等差数列{an},a7-2a4=-1,且a3=0,则公差d=( )
等差数列{an},a7-2a4=-1,且a3=0,则公差d=( )
己知{an}为等差数列,且a7-2a4=-1,a3=0,则公差d=______.2、已知Sn=1/3(an-1),
等差数列{an}中,公差d≠0,且a1,a3,a9成等比数列,则(a3+a6+a9)/(a4+a7+a10)=
已知{An}为等差数列,且A7-2A4=-1,A3=0,则公差d=?
已知等差数列{an}的公差d≠0,且a1,a3,a9成等比数列,则(a3+a6+a9)/(a4+a7+a10)=____
等差数列AN中,公差D不等于0.且A1,A3,A9成等比数列,则(A3+A6+A9)/(A4+A7+A10)=?
设等差数列{An}的公差为2,且a1+a4+a7=10,则a3+a6+a9的值为?
等差数列[an]的公差d包含于(0,1),且sin^2*a3-sin^2*a7/sin(a3+a7)=-1,当n=10时
等差数列an的公差为d ∈(0,1),且sin^2 a3 -sin^2 a7/sin(a3 a7)=-1 当n=10时,
若等差数列{an}的公差d≠0,且a1,a3,a7成等比数列,则a1a4=( )
{an}为等差数列,且a7-2a4=-1,a3=0,则公差d=? 求详细解释!我想要借助这个题来弄懂这一类题型,所以请各
已知等差数列an中a3*a7=-16,a4+a6=0,求首项a1和公差d