云南昆明2014年的中考数学卷的23题的计算感觉好乱啊,要如何算啊?果然是最后一道压轴题,求解如图,在平面直角坐标系中,抛物线y=ax^2+bx-3(a不等于0)与x轴交于点A(-2,0),B(4,0)两点,与y轴交于点C.(1)
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![云南昆明2014年的中考数学卷的23题的计算感觉好乱啊,要如何算啊?果然是最后一道压轴题,求解如图,在平面直角坐标系中,抛物线y=ax^2+bx-3(a不等于0)与x轴交于点A(-2,0),B(4,0)两点,与y轴交于点C.(1)](/uploads/image/z/13773787-43-7.jpg?t=%E4%BA%91%E5%8D%97%E6%98%86%E6%98%8E2014%E5%B9%B4%E7%9A%84%E4%B8%AD%E8%80%83%E6%95%B0%E5%AD%A6%E5%8D%B7%E7%9A%8423%E9%A2%98%E7%9A%84%E8%AE%A1%E7%AE%97%E6%84%9F%E8%A7%89%E5%A5%BD%E4%B9%B1%E5%95%8A%2C%E8%A6%81%E5%A6%82%E4%BD%95%E7%AE%97%E5%95%8A%3F%E6%9E%9C%E7%84%B6%E6%98%AF%E6%9C%80%E5%90%8E%E4%B8%80%E9%81%93%E5%8E%8B%E8%BD%B4%E9%A2%98%2C%E6%B1%82%E8%A7%A3%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx-3%28a%E4%B8%8D%E7%AD%89%E4%BA%8E0%29%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9A%28-2%2C0%29%2CB%284%2C0%29%E4%B8%A4%E7%82%B9%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C.%281%29)
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