计算：x^2+1/x^2-1 减 x-2/x-1 除 x-2/x

计算：x(x^2+x-1)-(x^2-x+1) 计算：x^2+1/x^2-1 减 x-2/x-1 除 x-2/x 计算 （x-1/x)/(x+1/x-2) 计算：x(x-1)(x+1)(x+2)-24 Lim(x>1) x-1/x^2+x-2.计算 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：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 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（x-4x+4/x-4减x/x+2）÷x-1/x+2 (x-2)^2-(x-1)/(x-2)+(x+1)/(x^2-x-2)计算 计算 2+x+3/x-1*x^2-2x+1/x^2+6x+9 计算:( x+1 )( x-1 )( x*2 +x+1 )( x*2 -x+1 )