已知关于二次函数y=x2-2x-a(1)如果此函数与x轴有两个交点,求a的取值范围(2)如果此函数与X轴的两个交点的横坐标为X1,X2,且满足1/x1+1/x2=-2/3,求a的值
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![已知关于二次函数y=x2-2x-a(1)如果此函数与x轴有两个交点,求a的取值范围(2)如果此函数与X轴的两个交点的横坐标为X1,X2,且满足1/x1+1/x2=-2/3,求a的值](/uploads/image/z/5937449-41-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%85%B3%E4%BA%8E%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dx2-2x-a%281%29%E5%A6%82%E6%9E%9C%E6%AD%A4%E5%87%BD%E6%95%B0%E4%B8%8Ex%E8%BD%B4%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89%E5%A6%82%E6%9E%9C%E6%AD%A4%E5%87%BD%E6%95%B0%E4%B8%8EX%E8%BD%B4%E7%9A%84%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E4%B8%BAX1%2CX2%2C%E4%B8%94%E6%BB%A1%E8%B6%B31%2Fx1%2B1%2Fx2%3D-2%2F3%2C%E6%B1%82a%E7%9A%84%E5%80%BC)
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