几道二次函数的题目1、已知函数y=ax^²+bx+c(a≠0)经过(0,1)和(2,-3)两点(1)如果此函数图像的开口乡下,对称轴在y轴的左侧,就a的取值范围(2)若对称轴经过(-1,0),平行于y轴的直
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![几道二次函数的题目1、已知函数y=ax^²+bx+c(a≠0)经过(0,1)和(2,-3)两点(1)如果此函数图像的开口乡下,对称轴在y轴的左侧,就a的取值范围(2)若对称轴经过(-1,0),平行于y轴的直](/uploads/image/z/10895784-24-4.jpg?t=%E5%87%A0%E9%81%93%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E9%A2%98%E7%9B%AE1%E3%80%81%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0y%3Dax%5E%26sup2%3B%2Bbx%2Bc%EF%BC%88a%E2%89%A00%EF%BC%89%E7%BB%8F%E8%BF%87%EF%BC%880%2C1%EF%BC%89%E5%92%8C%EF%BC%882%2C-3%EF%BC%89%E4%B8%A4%E7%82%B9%EF%BC%881%EF%BC%89%E5%A6%82%E6%9E%9C%E6%AD%A4%E5%87%BD%E6%95%B0%E5%9B%BE%E5%83%8F%E7%9A%84%E5%BC%80%E5%8F%A3%E4%B9%A1%E4%B8%8B%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E5%9C%A8y%E8%BD%B4%E7%9A%84%E5%B7%A6%E4%BE%A7%2C%E5%B0%B1a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89%E8%8B%A5%E5%AF%B9%E7%A7%B0%E8%BD%B4%E7%BB%8F%E8%BF%87%EF%BC%88-1%2C0%EF%BC%89%2C%E5%B9%B3%E8%A1%8C%E4%BA%8Ey%E8%BD%B4%E7%9A%84%E7%9B%B4)
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