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
计算:(3/x)+(x/x²-1)-(4/1-x)
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
有几道题求解,|x²-3x|>4,|x/1+x|>x/1+x
已知f(x)={x²-3x+4(x>0),{1-x(x
计算①x²-4/x²-4x+3÷x²+3x+2/x²-x②2x+6/4-4x+x
计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2
分式计算x²+2x/x²-6x+9÷x²-4/x²-3x