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✨ Best Answer ✨

平方完成のミスですね。
f(x)=-3/2t²+2t+3/2=-3/2{(t-2/3)²-4/9}+3/2
=-3/2(t-2/3)²+2/3+3/2
=-3/2(t-2/3)²+13/6
となります。

はるか

ありがとうございます

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