已知等差数列前n项和为Sn.且S13<0,S12>0,则此数列中绝对值最小的项为( )
已知等差数列前n项和为Sn.且S13<0,S12>0,则此数列中绝对值最小的项为( )
数列a(n)为等差数列中,S13<0,S12>0,则数列中绝对值最小的项为第几项
已知等差数列{an} 的前n项和为Sn,若S12>0,S13
设等差数列{an}的前n项和为Sn,已知S12>0,S13
设等差数列{an}的前n项和为Sn,已知a3=12,S12>0,S13<0
设等差数列{an}的前n项和为Sn,已知a3=12,且S12>0,S13
等差数列an ,前n项和为Sn,a1>0,且s12>0,s13
一.等差数列{An}前n项和为Sn,已知a3=12,S12>0,S13<0
等差数列{an}中,前n项和为Sn,a1>0,S12>0,S13
设等差数列{an}的前n项的和为Sn,已知a3=12,S12>0,S13
设等差数列an的前n项和为sn已知a3=12 s12大于0 s13小于0
设等差数列{an}的前n项和为Sn,已知a3=12,S12>0,S13