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a²(b＋c)－b²(c－a)－c²(a＋b)
=a²b＋a²c－b²c＋ab²－c²a－c²b
=a²b＋ab²－b²c－c²b＋a²c－c²a
=ab(a＋b)－bc(b＋c)＋ac(a－c)
Mathematics
Junior High
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この 問題が分かりません 解説お願いします
次の数を因数分解しなさいというものです
(3) a² (b+c)=6(c-a)-c²(a+b)
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ありがとうございます