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この式は
(a+b)^2＝a^2+2ab+b^2
↑
因数分解 ↑展開
の式なので
(2xy－1)^2
です！
(2xy－1)^2を乗すると4ｘ^2y^2－4xy+1になりますよね。
いいえ(^_^)
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