计算:1/5x² - 4x + x²/3 - 6x² + 3- x/3 -1
计算:(3/x)+(x/x²-1)-(4/1-x)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2
计算:[(-5+x)(-x-5)]² (x+3)²-(x+2)(x-1) (3x-a)(3x+a)(
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
计算5x(2x² -3x+1)
计算-4x(3x²-2x-1)
计算:1/5x² - 4x + x²/3 - 6x² + 3- x/3 -1
计算 ∫(x^4-2x^3+x^2+1)/x(x-1)² dx
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
计算: (x+3)(x²-x-2)