Mathematics
Senior High
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数Iの展開の問題です。（6）番の解説を教えてください🙏💦
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(2) (4x-5a)(4x+5a)
(+(4) (x-a)(a+x) x) (1)
(6) (a+b−c)(a−b+c)
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ありがとうございます😊