=x(x+y)−(x+y)
=Ax−A ←(x+y)をAと置く
=A(x−1) ←−Aは−1×A
=(x+y)(x−1) ←Aを戻す
だと思います。分かり辛くてすみません
=x(x+y)−(x+y)
=Ax−A ←(x+y)をAと置く
=A(x−1) ←−Aは−1×A
=(x+y)(x−1) ←Aを戻す
だと思います。分かり辛くてすみません
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ありがとうございます!