1.(a²-a)(a-2)-6
=a³-2a²-a²+2a-6
=(a³-3a²)+(2a-6)
=a²(a-3)+2(a-3)
=(a²+2)(a-3)
2.x²+10xy+25y²-1=0
(x+5y)²-1=0
(x+5y+1)(x+5y-1)=0
得x+5y+1=0,或x+5y=1
由x³+5x²y+x²变得x²(x+5y+1)
∴x³+5x²y+x²=x²(x+5y+1)=0或2x²
1.(a²-a)(a-2)-6
=a³-2a²-a²+2a-6
=(a³-3a²)+(2a-6)
=a²(a-3)+2(a-3)
=(a²+2)(a-3)
2.x²+10xy+25y²-1=0
(x+5y)²-1=0
(x+5y+1)(x+5y-1)=0
得x+5y+1=0,或x+5y=1
由x³+5x²y+x²变得x²(x+5y+1)
∴x³+5x²y+x²=x²(x+5y+1)=0或2x²