计算x²+4/x+3+x²-x-6/x+3-2x²-2x-5/x+3=
计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2
计算: (x+3)(x²-x-2)
计算 (x+3)(x²-x-2)
x/x-3-5x/x^2-x-6计算
计算①x²-4/x²-4x+3÷x²+3x+2/x²-x②2x+6/4-4x+x
计算x²+4/x+3+x²-x-6/x+3-2x²-2x-5/x+3=
x(x²-1)+2x²(x+1)-3x(2x-5)计算
分式计算x²+2x/x²-6x+9÷x²-4/x²-3x
分式计算:x²+2x/x²-6x+9÷x²-4/x²-3x
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
计算:2X²-5X+X²+4X-3X²-2