3a五次方-11a³b²-4ab四次方=a(3a的4次方-11a²b²-4b四次方）=a(a²-4b²)(3a²+b²)=a(a-2b)(a+2b)(3a²+b²)（a+1)x²+（a+1)x-6a-6=(a+1)x²+(a+1)x-6(a+1)=(...