学习数学,很重要的一个要求,就是学会运用数学知识来分析和解决实际问题.2003年各地中考试卷中,就出现了不少用方程或方程组解决实际问题的试题.例1某中学新建了一栋4层的教学大楼,每层楼有8间教室,进出这栋大楼共有4道门,其中两道正门大小相同,两道侧门大小也相同.安全检查中, One of the important requirements for learning mathematics is to learn to use mathematical knowledge to analyze and solve practical problems. In 2003, there were many problems in the middle school examination papers that used equations or equations to solve practical problems. Example 1 A secondary school was newly established A four-storey teaching building with 8 classrooms on each floor. There are 4 doors in and out of this building. Two of the main entrances are of the same size and the two side doors are of the same size. During the security check,