不等式两边同时乘或除以一个负数不等式的符号不是改变吗?急!在线等已知二次函数y=ax的平方+bx+c的图像与x轴交于点(-2,0)(x1,0) 且1<x1<2,与y轴的正半轴的交点在(0,2)的下方,下列结论:1
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![不等式两边同时乘或除以一个负数不等式的符号不是改变吗?急!在线等已知二次函数y=ax的平方+bx+c的图像与x轴交于点(-2,0)(x1,0) 且1<x1<2,与y轴的正半轴的交点在(0,2)的下方,下列结论:1](/uploads/image/z/3775134-30-4.jpg?t=%E4%B8%8D%E7%AD%89%E5%BC%8F%E4%B8%A4%E8%BE%B9%E5%90%8C%E6%97%B6%E4%B9%98%E6%88%96%E9%99%A4%E4%BB%A5%E4%B8%80%E4%B8%AA%E8%B4%9F%E6%95%B0%E4%B8%8D%E7%AD%89%E5%BC%8F%E7%9A%84%E7%AC%A6%E5%8F%B7%E4%B8%8D%E6%98%AF%E6%94%B9%E5%8F%98%E5%90%97%3F%E6%80%A5%21%E5%9C%A8%E7%BA%BF%E7%AD%89%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%E7%9A%84%E5%B9%B3%E6%96%B9%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9%28-2%2C0%29%EF%BC%88x1%2C0%EF%BC%89+%E4%B8%941%EF%BC%9Cx1%EF%BC%9C2%2C%E4%B8%8Ey%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E7%9A%84%E4%BA%A4%E7%82%B9%E5%9C%A8%EF%BC%880%2C2%EF%BC%89%E7%9A%84%E4%B8%8B%E6%96%B9%2C%E4%B8%8B%E5%88%97%E7%BB%93%E8%AE%BA%EF%BC%9A1)
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