a1=2/5,且2an-2a(n+1)=3an*a(n+1)a1=2/5,且2an-2a(n+1)=3ana(n+1) 试问数列an中,人已连续两项的乘积ak*a(k+1)是否仍为an中的项,如果是,是第几项?
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