Mathematics
Senior High
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教えてください。

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(3) A=x-z と置く
(4) (x-4)(x+4) を先に計算してそれに x^2+16 を掛ける
(5) (3a-2b)(3a+2b) を先に計算して最後に全体を二乗する

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ありがとうございます!

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