【简答题】已知二次函数f(x)=x 2 +bx+c(x∈R),同时满足以下条件: ①存在实数m,使得f(m)=0,且对任意实数x,恒有f(x)≥0成立; ②存在实数k (k≠0),使得f(1-k)=f(1+k)成立. (1)求函数y=f(x)的解析式; (2)设数列{a n }的前n项和为S n ,S n =f(n),数列{b n }满足关系式 b n = a n +2+ 2 ,问数列{b n }中是否存在...
【单选题】In some ways the employment interview is like a persuasive speech because the applicant seeks to persuade the employer to employ him or her. A job applicant has the responsibility for ascertaining(确定)...