It is known that a straight line passes through a point, and there is only one straight line that is parallel to the known straight line. Prove: is there only one straight line that passes through a point and is parallel? Su Can stared closely at this math problem, holding a pen in his hand and writing on the scratch paper....
本网站所有内容均收录于互联网相关站点,本站不提供影片资源储存也不参与录制与上传,若本站收录内容侵犯了您相关权益,请给我们留言,我们将及时进行处理。