如图,抛物线y=x2+bx+c交x轴于点A(-1,0)和点B(m,0),交y轴于点C,抛物线的顶点D,m>1(1)分别用m表示b和c(2)用m表示D的坐标(3)当m取何值时,△ABD是等边三角形?
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![如图,抛物线y=x2+bx+c交x轴于点A(-1,0)和点B(m,0),交y轴于点C,抛物线的顶点D,m>1(1)分别用m表示b和c(2)用m表示D的坐标(3)当m取何值时,△ABD是等边三角形?](/uploads/image/z/5305409-17-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx2%2Bbx%2Bc%E4%BA%A4x%E8%BD%B4%E4%BA%8E%E7%82%B9A%28-1%2C0%29%E5%92%8C%E7%82%B9B%28m%2C0%29%2C%E4%BA%A4y%E8%BD%B4%E4%BA%8E%E7%82%B9C%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9D%2Cm%3E1%EF%BC%881%EF%BC%89%E5%88%86%E5%88%AB%E7%94%A8m%E8%A1%A8%E7%A4%BAb%E5%92%8Cc%EF%BC%882%EF%BC%89%E7%94%A8m%E8%A1%A8%E7%A4%BAD%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%883%EF%BC%89%E5%BD%93m%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C%E2%96%B3ABD%E6%98%AF%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2%3F)
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