已知数列{an}满足a1=1,an+1={1/2an+n,n为奇数,an-2n,n为偶数}(1)求a1,a2;(2)当n》2时,求a2n-2与a2n的关系式,并求数列{an}中偶数项的通项公式;(3)求数列{an}前100项中所有奇数项的和
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