等差数列{an}中,已知公差d=1/2,且a1+a3+a5+···+a99=60.则a1+a2+a3+···+a100=
问题描述:
等差数列{an}中,已知公差d=1/2,且a1+a3+a5+···+a99=60.则a1+a2+a3+···+a100=
答
a1+a3+a5+···+a99=60
a2+a4+···+a100=60+50*1/2=85
a1+a2+a3+···+a100=145