﹙2x+5﹚2+﹙x-1﹚﹙3-x﹚-﹙x+4﹚﹙2-3x﹚=4x+10+3x-x²-3+x-2x+3x²+8-12x=-4x+2x²+15--------------------------------------------------------------------------------------采纳是我前进的动力~...