1.抛物线y=-2x²-4x的开口向 ,对称轴是 ,顶点坐标是 ,当x 时,y随x增大而增大;当x 时,y随x增大而减小;当x= 时函数有最 值,其值是?2.抛物线y=3x²+6x+c的顶点是(-1,2),则c=
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![1.抛物线y=-2x²-4x的开口向 ,对称轴是 ,顶点坐标是 ,当x 时,y随x增大而增大;当x 时,y随x增大而减小;当x= 时函数有最 值,其值是?2.抛物线y=3x²+6x+c的顶点是(-1,2),则c=](/uploads/image/z/3814072-16-2.jpg?t=1.%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-2x%26%23178%3B-4x%E7%9A%84%E5%BC%80%E5%8F%A3%E5%90%91+%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E6%98%AF+%2C%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%E6%98%AF+%2C%E5%BD%93x+%E6%97%B6%2Cy%E9%9A%8Fx%E5%A2%9E%E5%A4%A7%E8%80%8C%E5%A2%9E%E5%A4%A7%EF%BC%9B%E5%BD%93x+%E6%97%B6%2Cy%E9%9A%8Fx%E5%A2%9E%E5%A4%A7%E8%80%8C%E5%87%8F%E5%B0%8F%EF%BC%9B%E5%BD%93x%3D+%E6%97%B6%E5%87%BD%E6%95%B0%E6%9C%89%E6%9C%80+%E5%80%BC%2C%E5%85%B6%E5%80%BC%E6%98%AF%3F2.%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D3x%26%23178%3B%2B6x%2Bc%E7%9A%84%E9%A1%B6%E7%82%B9%E6%98%AF%EF%BC%88-1%2C2%EF%BC%89%2C%E5%88%99c%3D)
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