列方程解实际问题既是同学们学习的重点．也是一个难点．要突破这一难点,学会寻找等量关系是关键．那么怎样寻找实际问题中的等量关系呢? The solution of the actual problem of the equation of the column is the focus of the students’ learning. It is also a difficult point. To break through this difficulty, learning to find equal relationships is the key. So how to find the equal relationship in practical problems?