2,分解因式,x—3即为所求。再分母有理化。 =3倍根号2,0,x=3/﹙√2-1﹚=3﹙√2+1﹚=3√2+3 ﹙x²-x-6﹚/﹙x+2﹚ =﹙x+2﹚﹙x-3﹚/﹙x+2﹚ =x-3 =3√2+3-3 =3√2.,0,