设Sn是等差数列的前n项和,S7=3(a2+a12)则a7/a4的值为?
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设Sn是等差数列an的前n项和,若S3/S7=1/3,则S6/S7=
设Sn是等差数列 an 的前n项和,S7=3(a3+a7),求a5/a4的值
设Sn是等差数列的前n项和,S7=3(a2+a12)则a7/a4的值为?
设Sn是等差数列{an}的前n项和,已知a2=3,a6=11,则S7=?
设Sn是等差数列{an}的前n项和,已知a2=3,S11=121,则S7=
设Sn是等差数列an的前n项和,已知a2=3,S11=121,则S7等于
设Sn是等差数列an的前n项和,若S3/S6=1/3,则S6/S7=?
设Sn是等差数列{an}的前n项和,已知a1=3,a2=11,则S7等于?
设Sn是等差数列 an 的前n 项和,已知a2=3,a6=11,求S7.
设Sn是等差数列{an}的前n项和,已知a2=3,a6=11,则S7等于?
设Sn是等差数列的前n项和.若S3/S7=1/3,则S6/S7=?答案是27/35
设Sn为等差数列{a}的前n项和,s7=28,a7=-2,则a8=
设Sn是等差数列{an}的前n项和,若S7=35,则a4= 有人吗
设Sn是等差数列[an}的前n项和,若S7=5,则a4=
设Sn是等差数列(an)的前n项和,已知a2等于3,a6等于11,则S7等于
设Sn是等差数列{an}的前N项和,若S7=35,则a4为几?
设Sn是等差数列{an}的前n项和,已知a2=3,a6=11,则S7等于多少
设Sn是等差数列(an)的前n项和,已知a2=3,a6=11,则S7等于多少!