抛物线y=x²+bx+c与x轴交于A(1,0),B(3,0)两点.1.求函数的表达式.2.设在抛物线y=x²+bx+c与x轴交于A(1,0),B(3,0)两点.1.求函数的表达式.2.设在第一问的情况下抛物线上有一动点P,求当P在什么位
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![抛物线y=x²+bx+c与x轴交于A(1,0),B(3,0)两点.1.求函数的表达式.2.设在抛物线y=x²+bx+c与x轴交于A(1,0),B(3,0)两点.1.求函数的表达式.2.设在第一问的情况下抛物线上有一动点P,求当P在什么位](/uploads/image/z/749082-66-2.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%26%23178%3B%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%EF%BC%881%2C0%EF%BC%89%2CB%283%2C0%29%E4%B8%A4%E7%82%B9.1.%E6%B1%82%E5%87%BD%E6%95%B0%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F.2.%E8%AE%BE%E5%9C%A8%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%26%23178%3B%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%EF%BC%881%2C0%EF%BC%89%2CB%283%2C0%29%E4%B8%A4%E7%82%B9.1.%E6%B1%82%E5%87%BD%E6%95%B0%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F.2.%E8%AE%BE%E5%9C%A8%E7%AC%AC%E4%B8%80%E9%97%AE%E7%9A%84%E6%83%85%E5%86%B5%E4%B8%8B%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E6%9C%89%E4%B8%80%E5%8A%A8%E7%82%B9P%2C%E6%B1%82%E5%BD%93P%E5%9C%A8%E4%BB%80%E4%B9%88%E4%BD%8D)
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