Answers

一番下のやつ
ab(x-y)+a(y−x)
=ab(x-y)−a(x-y)
=a(x-y)(b-1)

Yun

プラスaがなぜ、マイナスになるのですか?

Yun

この問題もあっているか教えてもらってもいいですか?

なゆた

いかがでしょう

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