Mathematics
Senior High
3次式の因数分解a^3-b^3についてです。
a^3-b^3＝a^3+a^2b-a^2b-b^3 とした時に
a^3+a^2bと-a^2b-b^3の共通因数をくくりだす方法での証明方法を詳しく教えてください。
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