3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
(x-2分之3x-x+2分之x)乘x分之x²-4
计算: (x+3)(x²-x-2)
3x³-2x*x²
计算 (x+3)(x²-x-2)
计算①x²-4/x²-4x+3÷x²+3x+2/x²-x②2x+6/4-4x+x
2x²+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4