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文科客观题共16小题,其中有8题与理科客观题有别,下面介绍有别题的解析: (1)解析 (判别式法) 将直线(1+a)x+y+1=0与圆x2+y2-2x=0消去y得 (a2+2a+2)x2+2ax+1=0令△=0,得a=-1,故选D.
There are 16 questions in the subject of liberal arts. There are 8 questions which are different from the objective questions in science. The analysis of the other questions is as follows: (1) Analysis (discriminative method) The straight line (1+a)x+y+1=0 With the circle x2 + y2-2 x = 0 eliminate y (a2 + 2a +2) x2 + 2 ax +1 = 0 so that △ = 0, get a = -1, so choose D.