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  5. (2)を教えてください よろしくお願いします
Mathematics
Senior High
あ
あ

(2)を教えてください
よろしくお願いします

次の等式を証明せよ。 (1) |a+26²=|a|²+4㕯+4|6² (2) (a+b)•(a−b)=|a|-|61|2 ADA
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