二次函数图像与x轴交点在原点两侧的条件已知函数y=-ax2+bx+c图像经过(-1,2)(2,4)证明:无论a取何值,抛物线图像与x轴交点都在原点两侧
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![二次函数图像与x轴交点在原点两侧的条件已知函数y=-ax2+bx+c图像经过(-1,2)(2,4)证明:无论a取何值,抛物线图像与x轴交点都在原点两侧](/uploads/image/z/11685863-47-3.jpg?t=%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%E7%82%B9%E5%9C%A8%E5%8E%9F%E7%82%B9%E4%B8%A4%E4%BE%A7%E7%9A%84%E6%9D%A1%E4%BB%B6%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0y%3D-ax2%2Bbx%2Bc%E5%9B%BE%E5%83%8F%E7%BB%8F%E8%BF%87%EF%BC%88-1%2C2%29%282%2C4%29%E8%AF%81%E6%98%8E%EF%BC%9A%E6%97%A0%E8%AE%BAa%E5%8F%96%E4%BD%95%E5%80%BC%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E7%82%B9%E9%83%BD%E5%9C%A8%E5%8E%9F%E7%82%B9%E4%B8%A4%E4%BE%A7)
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