在高考题中经常碰到数列与解析几何相结合的题型,对这类问题有不少同学感到困难较多,现举例来说明其具体类型及求解方法.类型1数列与直线相结合例1(1993年上海高考题)设数列{a_n}的前n项和是S_n=an+bn(n-1)(n=1,2, In the college entrance examination questions often encounter the combination of sequence and analytical geometry of the problem, many students feel more difficult on such issues, are an example to illustrate the specific types and solution methods. (1993 Shanghai Entrance Examination) set the first n items of the sequence {a_n} and S_n = an + bn (n-1) (n = 1,2,