分类：教育/科学-理工学科-数学
问题：一道数学题，谢谢已知数列{an}满足a1=3,an=an
已知数列{an}满足a1=3,an=an-1-(3/an-1)（n大于等于2）n-1,n均为下标
求an

谢谢
回答：a2 = a1 = 3/a1 = 3 - 3/3 = 2
a3 = a2 - 3/a2 = 2 - 3/2 = 1/2
a4 = a3 - 3/a3 = 1/2 - 3/(1/2) = -11/2
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