若正项等差数列{an}和正项等比数列{bn}，且a1b1,a

更新 2022-09-03
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若正项等差数列{a_n}和正项等比数列{b_n}，且a₁=b₁,a₂=b₂,公差d＞0,则a_n与b_n（n≥3）的大小关系是（）

A．a_n＞b_n

B．a_n≥b_n

C．a_n＜b_n

D．a_n≤b

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