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y=-3x²+12x-3转换成y=a(x-h)²+kの形でレシピを完成させる y=-3x²+12x-3配合 =-3(x²-4x)-3 =-3(x²-4x+3+3×4 =-3(x-2)²+9 a=-3,h=2,k=9
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