刚学完了平面直角坐标系中点的坐标表示方法的明明感慨很深,但是好学的他又对求平面直角坐标系中两点间的距离提出了问题.大课间时,明明向同学们提出了这个问题.站在旁边的红红首先发表了自己的观点:“我们可以先从简单的方面来考虑.”她边说边画了一张图:“先求都在x轴上的两点间的距离.如图1,已知平面直角坐标系xOy,A、B两点坐标分别为(1,0)和(5,0),求AB的长度.则AB长为5-1=4.” Having just finished the plain feeling of the coordinate representation of the midpoint of the Cartesian coordinate system, he nevertheless eloquently asked questions about the distance between two points in the plane Cartesian coordinate system. The red red standing next to his own point of view: “We can first consider the simple aspects. ” She said, while drawing a picture: “First seek all in the x-axis As shown in Fig. 1, the plane rectangular coordinate system xOy is known, and the coordinates of point A and point B are (1,0) and (5,0), respectively, 1 = 4. ”