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本文从一道智力竞赛题出发,谈谈如何帮助学生提高解题分析能力.一、题目某次智力竞赛共有3题:第1题20分,余下两题每题25分,每题只有两种情况:答对得满分,答错得0分;结果统计如下:(1)每人至少答对了1题,3题全答对得只有4人,答对两题的有11人;(2)答对第1题的人数与答对第2题的人数之和为34人,答对第2题的人数与答对第3题的人数之和为24人,答对第1题的人数与答对第3题的人数之和为30人.求这次智力竞赛的平均成绩.有些学生对(2)的条件进行了转化,用设
This article from a quiz start, talk about how to help students improve their ability to solve problems.Question a quiz a total of 3 questions: the first question 20 points, the remaining two questions each question 25 points, each question only two cases : The answer to the perfect score, the wrong answer was 0 points; the results of the statistics are as follows: (1) at least each answered a question, 3 questions full answer only 4 people, answer the two questions of 11 people; (2) Of the total number of people who answered questions on the second question and the sum of 34 people, answer the number of questions on the second question and answer the third question on the sum of 24 people, answer the number of questions on the first question and answer the third question on the sum of 30 people. Find the average grade of the quiz. Some students converted the conditions of (2)