x+3x²+3x+1=x³+3+x²×1+3×x×1+1³=x³+3×x²×1+3×x×1²×1³=(x+1)³
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x+3x²+3x+1=x³+3+x²×1+3×x×1+1³=x³+3×x²×1+3×x×1²×1³=(x+1)³