二次方程式: 2x^2 + 6x - 15 = 0 を解く
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複素解の二次公式を使用して解く
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x^2 + 2x - 15 = 0、二次公式を使用して二次方程式を解きます。
広場を完成させる最良の方法
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x^2 - 2x - 15 = 0
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