黎明杀机检测到作弊:y= -1/2x^2+2x-1化为y=a(x-H)^2+K的形式
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y= -1/2x^2+2x-1化为y=a(x-H)^2+K的形式
y= -1/2x^2+2x-1=-1/2(x^2-4x+4-4)-1=-1/2(x^2-4x+4)+2-1=-1/2(x-2)^2+1
y= -1/2x^2+2x-1
=-1/2(x^2-4x+4)-1+2
=-1/2(x-2)^2+1
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