计算：x^2-3x-1/x-1 - x^2+3x+3/x+3 + 2x+12/x+3

计算：x/(x-1)-(x+3)/(x^-1)*(x^2+2x+1)/(x+3) 计算:[(x^2 - 4)/(x^2 - x - 6) + (x+2)/(x-3)] / (x+1)/(x-3) 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 计算(x+1)(x+2)(x+3)(x+4) 计算：（x+1)(x-2)(x-3)(x-6) 计算 x(x+3)-(x-1)(x-2） 如何计算 (x+1)(x+2)(x+3)(x+4) 计算(X-1)(X-2)(X-3)(X-4) (x-1)(x-2)(x-3)(x-4)-24计算 计算：x(x^2+x-1)-(x^2-x+1) 计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15) 计算:x/(1-x)-1/(x-3) 计算:|3-x|+|x-1|(x>5) 2x/x-1+1/x+3-3x+5/x^2+2x-3计算, 计算3x^3-(x^2 +2x)(3x-1)-3(x+5)(x-2) 计算 2+x+3/x-1*x^2-2x+1/x^2+6x+9 计算：(2x+3)(3x-4)>(x+1)(x-1)+5x(x+3)+7 (x-6)(x的平方+x+1)-x(2x+1)(3x-1)计算