为什么用tan定义平面直角坐标系内直线的斜率？

为什么用tan定义平面直角坐标系内直线的斜率？

SHU XUE JIAO XUE ›› 2018, Vol. 1 ›› Issue (6) : 22-23.

SHU XUE JIAO XUE ›› 2018, Vol. 1 ›› Issue (6) : 22-23.

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