已知抛物线y=(-1/7)x^2+bx+c和x轴正半轴交于A,B两点,AB=4,P为抛物线上一点,它的横坐标为9,角PBO=135度,cot角PAB=7/3(1)求点P的坐标 (2)求抛物线的关系式是关于二次函数的一道题,.
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![已知抛物线y=(-1/7)x^2+bx+c和x轴正半轴交于A,B两点,AB=4,P为抛物线上一点,它的横坐标为9,角PBO=135度,cot角PAB=7/3(1)求点P的坐标 (2)求抛物线的关系式是关于二次函数的一道题,.](/uploads/image/z/3145352-32-2.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D%28-1%2F7%29x%5E2%2Bbx%2Bc%E5%92%8Cx%E8%BD%B4%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2CAB%3D4%2CP%E4%B8%BA%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E5%AE%83%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E4%B8%BA9%2C%E8%A7%92PBO%3D135%E5%BA%A6%2Ccot%E8%A7%92PAB%3D7%2F3%281%29%E6%B1%82%E7%82%B9P%E7%9A%84%E5%9D%90%E6%A0%87+%282%29%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%85%B3%E7%B3%BB%E5%BC%8F%E6%98%AF%E5%85%B3%E4%BA%8E%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E4%B8%80%E9%81%93%E9%A2%98%2C.)
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