Not difficult. The average score is 90. According to the statistics of the results of the 20 17 senior high school entrance examination by Nanjing Education Bureau, we can know that the basic math questions in the 20 17 senior high school entrance examination account for 70% of the examination paper, which is reasonable in structure and not difficult, with an average score of 90, which belongs to the scoring items of all subjects in the senior high school entrance examination.