X-2-(x²/ x+2)
1.(x²-x+2)(-x-2-x²)
X-2-(x²/ x+2)
1.(3x²+2x-8)²-(x²-2x-8)²
计算:[(x²-2x+1)/(x²-1)]÷[(x-1)(x²+x)]-x
(x+y)²-2(x²-y²)+(y-x)²
(1)(x²-2x)²+2(x²-2x)+1
(x²-2x)²+2x²-4x+1
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
2(x²-1²)
(x²-5x+6分之x²-3x+2)²/(x²-2x-3分之x-1)²
因式分解:(x²+4x+8)²+3x(x²+4x+8)+2x² x²(
先化简再求值x²-x/(x+1)×x²-1/(x²-2x+1)