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下面将1998年全国高考理科数学、2007年重庆高考理科数学与2009年山东高考理科数学中的数列题梳理如下:(1998年全国卷·理25):已知数列{b_n}是等差数
The following 1998 the national college entrance examination science math, 2007 Chongqing college entrance examination science math and Shandong college entrance examination science math in the sequence of numbers combed as follows: (1998 National Volume Li 25): Known series {b_n} is the arithmetic difference