Mathematics
Junior High
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【至急】

この因数分解の途中式を教えてください

(38) 2集計

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✨ Best Answer ✨

a²−a−b²−b
=a²−b²−a−b
=(a+b)(a−b)−(a+b)
=(a+b)(a−b−1)

こんなかんじでしょうか?

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