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a^2-2a+1 =(a-1) これは完全に正方形です (a+b)^2=a^2+2ab+b^2. (a-b)^2=a^2-2ab+b^2 あなたのために解決してうれしい! 下の[回答に満足]ボタンをクリックしてください。
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