(X²-3X)²-2X²+6X-8,
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
6x+(2x²-3x)-(x²-1)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
计算:(x²-2x-8)分之(2-x)+(3x+6)分之(x+4)
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
计算①x²-4/x²-4x+3÷x²+3x+2/x²-x②2x+6/4-4x+x
9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x
计算: (x+3)(x²-x-2)
3x³-2x*x²
计算 (x+3)(x²-x-2)