1.y=-1/2x²-2x-1 化为y=a（x+m）²+k的形式.2.y=-1/2x²+1/3x-1_数学解答

1.y=-1/2x²-2x-1 化为y=a（x+m）²+k的形式.
2.y=-1/2x²+1/3x-1/6 的对称轴和顶点坐标

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解答

1.y=-1/2x²-2x-1=-1/2(x²+4x)-1=-1/2(x+2)²-1+2=-1/2(x+2)²+12.y=-1/2x²+1/3x-1/6 =-1/2(x²-2/3x)-1/6=-1/2(x-1/3)²-1/6+1/18=-1/2(x-1/3)²-1/9对称轴：x=1/3顶点坐标：(1/...