如图,已知抛物线y=- 3/4x²+bx+c与坐标轴交于A,B,C三点,点A的横坐标为-1,过点C(0,3)的直线y=-( 3/4t)x+3与x轴交于点Q,点P是线段BC上的一个动点,PH⊥OB于点H.若PB=5t,且0<t<1.(1)确定b,c的值
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![如图,已知抛物线y=- 3/4x²+bx+c与坐标轴交于A,B,C三点,点A的横坐标为-1,过点C(0,3)的直线y=-( 3/4t)x+3与x轴交于点Q,点P是线段BC上的一个动点,PH⊥OB于点H.若PB=5t,且0<t<1.(1)确定b,c的值](/uploads/image/z/4349271-39-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-+3%2F4x%26%23178%3B%2Bbx%2Bc%E4%B8%8E%E5%9D%90%E6%A0%87%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%2CC%E4%B8%89%E7%82%B9%2C%E7%82%B9A%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E4%B8%BA-1%2C%E8%BF%87%E7%82%B9C%EF%BC%880%2C3%EF%BC%89%E7%9A%84%E7%9B%B4%E7%BA%BFy%3D-%EF%BC%88+3%2F4t%EF%BC%89x%2B3%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9Q%2C%E7%82%B9P%E6%98%AF%E7%BA%BF%E6%AE%B5BC%E4%B8%8A%E7%9A%84%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%2CPH%E2%8A%A5OB%E4%BA%8E%E7%82%B9H%EF%BC%8E%E8%8B%A5PB%3D5t%2C%E4%B8%940%EF%BC%9Ct%EF%BC%9C1%EF%BC%8E%EF%BC%881%EF%BC%89%E7%A1%AE%E5%AE%9Ab%2Cc%E7%9A%84%E5%80%BC)
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