计算{x+2}{x+3}-{x-6}{x-1}

计算：（x+1)(x-2)(x-3)(x-6) x/x-3-5x/x^2-x-6计算 计算x^2-5x+6/x^2-1/x^2+x/x-3 计算（x*x+4x+5）/（x+2）-（x*x+6x+10）/（x+3）+1 计算：(x-1)/(x^2+3x+2)+6/(2+x-x^2)-(10-x)/(4-x^2) 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) 计算:(x+2)/(x^2 - x - 6) + 2x/(x^2 - 3x) - x/(x^2 - 6x + 9) 计算1/x-3 - 6/x*x-9 - x-1/6-2x 计算x/(x^2-1) + (x^-x+1)/(x^3-x^2+x-1)+(x^2+x+1)/(x^3+x^2+x+1) 计算：3/(2x+4)-6/(4-x^2)+1/(x-2)；(3x/(x-2)-x/(x+2))*(x^2-4)/x.