y=-1/2x²+2x化为顶点式

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y=-1/2x²+2x化为顶点式
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y=-1/2x²+2x化为顶点式
y=-1/2x²+2x化为顶点式

y=-1/2x²+2x化为顶点式
y=-1/2(x²-4x)
=-1/2(x²-4x+4-4)
=-1/2(x²-4x+4)+2
=-1/2(x-2)²+2