(1)(x的三次方+x²+x+1)/(x+1) =[﹙x³+x²﹚＋(x＋1)]/(x+1)= [x²﹙x＋1﹚＋﹙x＋1﹚]/﹙x＋1﹚=﹙x＋1﹚﹙x²＋1﹚/﹙x＋1﹚=x²＋1（2）（ab²-a²b)/(a-b)=ab﹙b-a﹚/﹙a-b﹚=...