已知抛物线y=-x²+bx+c与x轴的两个交点分别为A(m,0),B(n,0),且m已知抛物线y=-x²+bx+c与x轴的两个交点分别为A(m,0),B(n,0),且m+n=4,m╱n=1╱3.求此抛物线的解析式
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![已知抛物线y=-x²+bx+c与x轴的两个交点分别为A(m,0),B(n,0),且m已知抛物线y=-x²+bx+c与x轴的两个交点分别为A(m,0),B(n,0),且m+n=4,m╱n=1╱3.求此抛物线的解析式](/uploads/image/z/13338277-61-7.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%EF%BC%9D-x%26%23178%3B%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%E5%88%86%E5%88%AB%E4%B8%BAA%EF%BC%88m%2C0%EF%BC%89%2CB%EF%BC%88n%2C0%EF%BC%89%2C%E4%B8%94m%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%EF%BC%9D-x%26%23178%3B%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%E5%88%86%E5%88%AB%E4%B8%BAA%EF%BC%88m%2C0%EF%BC%89%2CB%EF%BC%88n%2C0%EF%BC%89%2C%E4%B8%94m%2Bn%EF%BC%9D4%2Cm%E2%95%B1n%3D1%E2%95%B13.%E6%B1%82%E6%AD%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F)
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