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この問題はすべて
【a2＋2ab＋b2＝(a＋b)2】
の形に戻す問題なので、
(1) (x＋7)2
(2) (a－3)2
(3) (9－x)2
(4) (x－y)2
(5) (2p＋3q)2
(6) (x－1/2)2
になります！
ありがとうございます！
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ありがとうございます！