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直角坐标系这一节的重点是求点的坐标.那么,怎样才能使求出的坐标不多不少呢?恰当的分类,能帮助同学们解决这个难点.
The focus of this section of the Cartesian coordinate system is to find the coordinates of the point. So, how can we make the calculated coordinates not much? The appropriate classification can help students solve this difficulty.