已知抛物线Y=-X∧2+AX+1/2与直线Y=2X1)求证:抛物线与直线相交(2)当抛物线的顶点在直线下方时,求A的取值范围(3)当A在(2)的取值范围内时,求抛物线截直线所得弦长的最小值
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![已知抛物线Y=-X∧2+AX+1/2与直线Y=2X1)求证:抛物线与直线相交(2)当抛物线的顶点在直线下方时,求A的取值范围(3)当A在(2)的取值范围内时,求抛物线截直线所得弦长的最小值](/uploads/image/z/14567879-47-9.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFY%3D-X%E2%88%A72%2BAX%2B1%2F2%E4%B8%8E%E7%9B%B4%E7%BA%BFY%3D2X1%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8E%E7%9B%B4%E7%BA%BF%E7%9B%B8%E4%BA%A4%EF%BC%882%EF%BC%89%E5%BD%93%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9C%A8%E7%9B%B4%E7%BA%BF%E4%B8%8B%E6%96%B9%E6%97%B6%2C%E6%B1%82A%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%883%EF%BC%89%E5%BD%93A%E5%9C%A8%282%29%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E5%86%85%E6%97%B6%2C%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E6%88%AA%E7%9B%B4%E7%BA%BF%E6%89%80%E5%BE%97%E5%BC%A6%E9%95%BF%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC)
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