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これでも大丈夫です🌈おそらく答えは
(c-b)を-(b-c)と見て
(a-c)を-(c-a)と見て
トータルで
(a-b)(b-c)(c-a)としています♪

ぺぺろん

あと、aを基準にしてたけど、b基準とかでも大丈夫ですかね?

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