在实际问题的教学过程中,发现很多同学对于计算比赛场数类问题颇感迷惑,主要是由于比赛场数过多,所以在计算的过程中往往会或重或漏,难以得到正确答案.本文通过简单易学的图形图表法来解决这一问题.首先,从课本中的例题谈起.例1(人教版九年级上册第25页)某学校要组织一次排球邀请赛,参赛的每两个队之间都要比赛一场,根据场地和时间等条件,赛程计划安排7天,每天安排4场比赛,比赛组织者应邀请多少个队参赛? In the process of teaching practical problems, many students find it quite confusing to calculate the type of playing field, mainly because of the excessive number of playing fields, so they often lose weight in the process of calculation, which makes it difficult to get the correct answer. First of all, from the textbook example to talk about .Example 1 (PEP 9th grade on page 25) a school to organize a volleyball tournament, every two teams participating Between the competition, according to the venue and time and other conditions, the schedule is scheduled for 7 days, arranged for 4 games a day, the game organizers should invite the number of teams participating?