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,则a2=?
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,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2,若A1 A3 A4 成等比数列,求A2?
等差数列an的公差为d=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成等比则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的公差是2,若a1,a3,a4成等差数列,则a2等于
等差数列{an}中公比为3,若a1,a3,a4成等比数列,则a2=?