Mathematics
Senior High
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なぜマイナスがつくのかがわかりません

3) a²(b-c)+ b²(c-a)+c²(a−b) =(b-c)a²-(b²-c²) a+b²c-c²b =(b-c)a²-(b-c)(b+c)a + bc(b-c) =(b-c){a²-(b+c)a+bc} =-(a−b)(b-c)(c-a)

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