二次函数y=ax²-bx+b(a>0,b>0)图像顶点的纵坐标不大于(-b/2)1.求该二次函数图像顶点的横坐标的取值范围.2.若该二次函数图像与x轴交于A,B两点,求线段AB长度的最小值.
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![二次函数y=ax²-bx+b(a>0,b>0)图像顶点的纵坐标不大于(-b/2)1.求该二次函数图像顶点的横坐标的取值范围.2.若该二次函数图像与x轴交于A,B两点,求线段AB长度的最小值.](/uploads/image/z/3773213-53-3.jpg?t=%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%26%23178%3B-bx%2Bb%EF%BC%88a%3E0%2Cb%3E0%29%E5%9B%BE%E5%83%8F%E9%A1%B6%E7%82%B9%E7%9A%84%E7%BA%B5%E5%9D%90%E6%A0%87%E4%B8%8D%E5%A4%A7%E4%BA%8E%28-b%2F2%291.%E6%B1%82%E8%AF%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E5%9B%BE%E5%83%8F%E9%A1%B6%E7%82%B9%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.2.%E8%8B%A5%E8%AF%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2C%E6%B1%82%E7%BA%BF%E6%AE%B5AB%E9%95%BF%E5%BA%A6%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC.)
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