(1/2)高二数学题:1、在等差数列中,S8=100,S16=392,则S24=?2、已知等差数列{an}满足a3=7,a5...
(1/2)高二数学题:1、在等差数列中,S8=100,S16=392,则S24=?2、已知等差数列{an}满足a3=7,a5+a7=26,则