x1x2+y1y2=2,怎么推出(y1y2)^2+y1y2-2=0已知F为抛物线y^2=x的焦点,点A,B在该抛物线上且位于x轴的两侧,OA•OB=2(其中O为坐标原点),则△ABO与△AFO面积之和的最小值是请问最后一步怎么算出来的http:
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![x1x2+y1y2=2,怎么推出(y1y2)^2+y1y2-2=0已知F为抛物线y^2=x的焦点,点A,B在该抛物线上且位于x轴的两侧,OA•OB=2(其中O为坐标原点),则△ABO与△AFO面积之和的最小值是请问最后一步怎么算出来的http:](/uploads/image/z/11448220-4-0.jpg?t=x1x2%2By1y2%3D2%2C%E6%80%8E%E4%B9%88%E6%8E%A8%E5%87%BA%28y1y2%29%5E2%2By1y2-2%3D0%E5%B7%B2%E7%9F%A5F%E4%B8%BA%E6%8A%9B%E7%89%A9%E7%BA%BFy%5E2%3Dx%E7%9A%84%E7%84%A6%E7%82%B9%2C%E7%82%B9A%2CB%E5%9C%A8%E8%AF%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E4%B8%94%E4%BD%8D%E4%BA%8Ex%E8%BD%B4%E7%9A%84%E4%B8%A4%E4%BE%A7%2COA%26%238226%3BOB%3D2%EF%BC%88%E5%85%B6%E4%B8%ADO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%EF%BC%89%2C%E5%88%99%E2%96%B3ABO%E4%B8%8E%E2%96%B3AFO%E9%9D%A2%E7%A7%AF%E4%B9%8B%E5%92%8C%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF%E8%AF%B7%E9%97%AE%E6%9C%80%E5%90%8E%E4%B8%80%E6%AD%A5%E6%80%8E%E4%B9%88%E7%AE%97%E5%87%BA%E6%9D%A5%E7%9A%84http%3A)
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