Mathematics
Senior High

この問題の解き方がわかりません。
答えは(2x+y)(4xの2乗+10xy+7yの2乗)です。

Answers

3乗の因数分解の公式にあてはめます
8(x+y)^3-y^3
={2(x+y)-y}{4(x+y)^2+2(x+y)y+y^2}
=(2x+y)(4x^2+10xy+7y^2)

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