一、说教材1.教材的地位与作用《点到直线距离公式》是北师大版教材必修2第二章第一节的第五小节“平面直角坐标系中的距离”的一个内容,学生已经掌握了平面上两点的距离公式的推导与运用,在此基础上进一步得到“点到直线距离”的计算方法。通过本节学习,学生将会把点到直线的距离转化为两点距离来计算,并从中抽象出推导公式的算法流程;但由于涉及字母运算,难度增加,教材上不要求推导过程,而在必修4的向量的应用中专门安排了公式的向量推导方法。 First, the teaching material 1 textbook status and role “point to the straight line distance formula” is the Beijing Normal University edition of compulsory 2 Chapter II of the first section of the fifth section “Cartesian coordinates of the distance ” of a content , The students have mastered the derivation and application of the distance formula of two points on the plane, and on this basis, the calculation method of “point-to-line distance” is further obtained. Through this section, students will calculate the distance from point to line to the distance between two points, and abstract the algorithm flow for deriving the formula. However, because of the difficulty of increasing the number of letters, the process of derivation is not required in the textbook. Compulsory 4 vector application of a special arrangement of the formula vector derivation method.