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a³−b³=(a−b)(a²+ab+b²)の因数分解を利用してます
Mathematics
Senior High
Resolved
この問題の式が、なぜ3行目のようになるか分かりません。
(3)プー9x²+8
(2²²= 1) (x²-80)
(x-2)(x+x2+2%)×(x-1)(x+x1+12)
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