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判別式のa,b,cにそれぞれ①の値を代入しただけです。ax^2+bx+c=3x^2-2kx+2kであるため、
a=3 b=2k c=2k

自称進

訂正→ax^2+2bx+c=3x^2-2kx+2kであるため、
a=3 b=-k c=2k

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