已知等差数列(An)的公差为2,若a1,a2,a3,a4,成等比数列则a2的值为?
已知等差数列{an}的公差为2,若a1,a3,a4成等比数列,则a2=?
已知等差数列{an}的公差为2,若a1,a3,a4成等比数列,则a2+a3的值为( )
已知等差数列{an}的公差为3,若a1,a3,a4成等比数列,则a2=
已知等差数列{An}的公差为2,若A1 A3 A4 成等比数列,求A2?
已知等差数列{an}的公差为2,若a1,a3,a4成等比数列,则a2=( )
等差数列an ,的公差为3,若a1,a3,a4成等比数列,则a2=?
等差数列an的公差为d=2,若a1,a3,a4成等比数列,求a2.
1、等差数列{an}的公差为2,若a1 a3 a4成等比数列,a2等于?
已知等差数列(an)的公差为2,若a1,a3,a4成等比则a2=?
已知等差数列{an}的公差为3,若a1,a3,a4成等比数列,则a2=( )
等差数列An散文公差为d不等于0,若a1,a3,a9成等比数列,则(a1+a3+a9)/(a2+a4+a10)的值为(
已知等差数列AN的公差是2,若a1,a3,a4成等差数列,则a2等于