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October 07, 201757平面直角坐标系之有序数对18 minutesPlay拥抱第一象限定理,象限,坐标轴。有序数对:把有顺序的两个数a与b组成的数对,叫做有序数对。记作(a,b)点的表示,比如,点(2,1)...moreShareView all episodesBy 方先生侃数理化October 07, 201757平面直角坐标系之有序数对18 minutesPlay拥抱第一象限定理,象限,坐标轴。有序数对:把有顺序的两个数a与b组成的数对,叫做有序数对。记作(a,b)点的表示,比如,点(2,1)...more
October 07, 201757平面直角坐标系之有序数对18 minutesPlay拥抱第一象限定理,象限,坐标轴。有序数对:把有顺序的两个数a与b组成的数对,叫做有序数对。记作(a,b)点的表示,比如,点(2,1)...more