给你一个清晰的过程：1.-4(x-2y)²+9(x+y)² =9(x+y)²-4(x-2y)²=[3(x+y)+2(x-2y)][3(x+y)-2(x-2y)]=[3x+3y+2x-4y][3x+3y-2x+4y]=(5x-y)(x+7y)2.x³-x²-x+1 =(x³-x²)-(x-1)=x²(x-1)...