在数列{an}中,an=4n-5/2,a1+a2+···+an=an²+bn,其中a,b为常数,则ab=?why
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![在数列{an}中,an=4n-5/2,a1+a2+···+an=an²+bn,其中a,b为常数,则ab=?why](/uploads/image/z/4489212-12-2.jpg?t=%E5%9C%A8%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Can%3D4n-5%2F2%2Ca1%2Ba2%2B%C2%B7%C2%B7%C2%B7%2Ban%3Dan%26sup2%3B%2Bbn%2C%E5%85%B6%E4%B8%ADa%2Cb%E4%B8%BA%E5%B8%B8%E6%95%B0%2C%E5%88%99ab%3D%3Fwhy)
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