二次函数的图象与直线y=1的交点A(-1,1)B(2,1),且过(-3,6)①求抛物线的表达式.②在抛物线对称轴上求一点D第一问:设它的解析式为y=a(x-1/2)²+k.将点(-1,1)和(-3,6)代入得:9a/4+k=1,49a/4+k=6.解
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![二次函数的图象与直线y=1的交点A(-1,1)B(2,1),且过(-3,6)①求抛物线的表达式.②在抛物线对称轴上求一点D第一问:设它的解析式为y=a(x-1/2)²+k.将点(-1,1)和(-3,6)代入得:9a/4+k=1,49a/4+k=6.解](/uploads/image/z/5752718-62-8.jpg?t=%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E5%9B%BE%E8%B1%A1%E4%B8%8E%E7%9B%B4%E7%BA%BFy%3D1%E7%9A%84%E4%BA%A4%E7%82%B9A%28-1%2C1%29B%282%2C1%29%2C%E4%B8%94%E8%BF%87%28-3%2C6%29%E2%91%A0%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F.%E2%91%A1%E5%9C%A8%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8A%E6%B1%82%E4%B8%80%E7%82%B9D%E7%AC%AC%E4%B8%80%E9%97%AE%EF%BC%9A%E8%AE%BE%E5%AE%83%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E4%B8%BAy%3Da%28x-1%2F2%29%26%23178%3B%2Bk.%E5%B0%86%E7%82%B9%EF%BC%88-1%2C1%EF%BC%89%E5%92%8C%EF%BC%88-3%2C6%EF%BC%89%E4%BB%A3%E5%85%A5%E5%BE%97%EF%BC%9A9a%2F4%2Bk%3D1%2C49a%2F4%2Bk%3D6.%E8%A7%A3)
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