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二次函数动点问题25
Author:
刘晚钰
GeoGebra
在平面直角坐标系中,O为原点,直线y=--2x-1与y轴交于点A,与直线y=-x交于点B,点B关于原点的对称点为点C (1)求过A,B,C三点的抛物线的解析式; (2)P为抛物线上一点,它关于原点的对称点为Q ①当四边形PBQC为菱形时,求点P的坐标; ②若点P的横坐标为t(-1< t <1),当t为何值时,四边形PBQC面积最大?
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