等差数列{an}的公差d≠0,比较a4a9与a6a7的大小

来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/19 15:49:11
等差数列{an}的公差d≠0,比较a4a9与a6a7的大小等差数列{an}的公差d≠0,比较a4a9与a6a7的大小等差数列{an}的公差d≠0,比较a4a9与a6a7的大小a4a9=(a1+3d)(

等差数列{an}的公差d≠0,比较a4a9与a6a7的大小
等差数列{an}的公差d≠0,比较a4a9与a6a7的大小

等差数列{an}的公差d≠0,比较a4a9与a6a7的大小
a4a9=(a1+3d)(a1+8d)=a1^2+11a1d+24d^2
a6a7=(a1+5d)(a1+6d)=a1^2+11a1d+30d^2
a4a9-a6a7=a1^2+11a1d+24d^2-(a1^2+11a1d+30d^2)
=-6d^2<0
a4a9

等差数列{an}的公差d≠0,比较a4a9与a6a7的大小 等差数列{an}的公差d≠0,试比较a4a9与a6a7的大小. 等差数列{an}的公差d 等差数列{an}的公差d 等差数列an的公差d 等差数列{an}的公差d 设等差数列an的公差为d,(d≠0),若n>1(n∈N*),比较a1*a(n+1)与a2*an的大小 已知等差数列an的公差d不等于0 若等差数列an的公差d 已知等差数列{An}的公差d 在等差数列{an}的公差d 已知等差数列{an}的公差d 已知等差数列{an}的公差d 关于等差数列的一道题等差数列{an}的公差d 等差数列{An}中,公差d 等差数列{an}中,公差d 等差数列{an}是公差d 等差数列{an}是公差d