4√﹙x-2﹚^4-√﹙x²-2x+1﹚=4﹙x-2﹚²-√﹙x-1﹚²=4﹙x-2﹚²-﹙x-1﹚
=4x²-17x+17,x≥2;
1≦x<2,,原式=4﹙2-x﹚²-﹙1-x﹚=4x²-15x+15;
x<1,原式=4x²-15x+15;