在高中数学《直线与方程》一章中,我们学习了直角坐标系下两直线位置关系的判定方法。其中有关平行和垂直的判定是重点,常见于试卷的考题中。但是,两直线平行在一般式中的结论有时并没有真正被理解。一、问题的提出笔者发现,在讨论平行的位置关系时,有些资料书上给出了这 In the chapter “Lines and equations” of the high school mathematics, we have studied the method of judging the positional relationship between two straight lines in a rectangular coordinate system. Among them, the determination of parallelism and verticality is the focus, which is common in examination papers. However, the conclusion that two straight lines are parallel in the general formula is sometimes not really understood. First, the question was raised. The author found that in the discussion of parallel positional relationships, some data books give this