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数学期中学情调研刚刚开始,我就急匆匆地把试卷浏览了一遍,总体来时说不是很难,还是以基础题居多,其中还有评价手册上的一道原题,我想这题的得分率应该蛮高的,可是实际情况得分并不是很高.原题呈现:某次知识竞赛,共有50道题,评分标准:每答对一题得2分,答错一道题扣1分,不答不得分.某学生有4道题未答.问这个学生至少要答对多少道题得分才能不低于82分?一、学生典型错误
Math semester secondary school conditions research has just begun, I hurriedly browse papers again, the overall time is not difficult to say, or based on the majority of questions, which also have an evaluation manual on the original title, I think this question scoring rate Should be quite high, but the actual situation score is not very high. The original title is presented: a knowledge contest, a total of 50 questions, grading standards: each answer to a question two points, wrong answer a question deduction of 1 point, no answer A student has four questions unanswered Ask the student at least to answer how many questions to score no less than 82 points? First, the typical student error