a²=-3a-1a³=a*a²=a(-3a-1)=-3a²-a=-3(-3a-1)=9a+3a^4=(a²)²=(-3a-1)²=9a²+6a+1=9(-3a-1)+6a+1=-21a-8原式=3a³+a^4+5a²-5a²-6a=a^4+3a³-6a=-21a-8+3(9a...