求下列二次函数的开口方向,对称轴和顶点坐标.y=5(x-1)^2 ;y=2x^2-4x-1 ; y=3x^2-6x+2 ; y=(x+1)(x-2) ; y=-3(x+3)(x+9)
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![求下列二次函数的开口方向,对称轴和顶点坐标.y=5(x-1)^2 ;y=2x^2-4x-1 ; y=3x^2-6x+2 ; y=(x+1)(x-2) ; y=-3(x+3)(x+9)](/uploads/image/z/3650308-52-8.jpg?t=%E6%B1%82%E4%B8%8B%E5%88%97%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E5%BC%80%E5%8F%A3%E6%96%B9%E5%90%91%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E5%92%8C%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87.y%3D5%28x-1%29%5E2+%EF%BC%9By%3D2x%5E2-4x-1+%3B+y%3D3x%5E2-6x%2B2+%3B+y%3D%28x%2B1%29%28x-2%29+%3B+y%3D-3%28x%2B3%29%28x%2B9%29)
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