题目

等差数列{an}中,若a3+a5=a7-a3=24,则a2=__________. 答案：0解析:∵a7-a3=24,∴d=6.又∵a3+a5=24,∴a2+d+a2+3d=24,2a2+24=24,a2=0.-- Which of the two T-shirts will you take?-- I'll take ____________. One is for my brother and the other is for myself.A.bothB.eitherC.neitherD.all