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2解を 2m、3m とおき、解と係数の関係から
2m+3m = 5、2m•3m = -k
↔︎ m = 1、k = -6

k = -6 を方程式に代入して
x²-5x+6 = 0
↔︎ (x-2)(x-3) = 0
↔︎ x = 2,3

ミルクティー

丁寧に解説をありがとうございます

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