(x+1/x+3)²÷x²-1/x²-9·(x-2)(x+1)/x-3计算
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
计算(1+1/x)÷(2x-1+x²/x) 2x/x²-9+1/3-x+x+2/x+3
x(x²-1)+2x²(x+1)-3x(2x-5)计算
计算:(3/x)+(x/x²-1)-(4/1-x)
计算[x(x²-2x+3)-3x]÷2分之1x²
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
计算:(1+1/x)·x²-2x+1/x²-1;(x²/x-1-2x/1-x)÷x/x-1
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?
计算:[(-5+x)(-x-5)]² (x+3)²-(x+2)(x-1) (3x-a)(3x+a)(
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
计算:(3x-3/x²-1)÷(3x/x+1)-1/x-1
计算 ∫(x^4-2x^3+x^2+1)/x(x-1)² dx