| A(x)=(x^2+x+1)P(x)+2x+1 B(x)=(x^2+x+1)Q(x)+5x-3とおくとぉん A(x)B(x)={(x^2+x+1)P(x)+2x+1}{(x^2+x+1)Q(x)+5x-3} =(x^2+x+1)^2P(x)Q(x)+(x^2+x+1)(5x-3)P(x)+(x^2+x+1)(2x+1)Q(x)+(2x+1)(5x-3) =(x^2+x+1)R(x)+(2x+1)(5x-3) ((x^2+x+1)P(x)Q(x)+(5x-3)P(x)+2x+1)Q(x)=R(x)) =(x^2+x+1)R(x)+10(x^2+x+1)-11x-13 =(x^2+x+1)R'(x)-11x-13 (R'(x)=R(x)+10)
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