>> solve('7/(x^2)+3/(x^2-2)-8/(x^2-1)') ans = -(2+i*3^(1/2))^(1/2) (2+i*3^(1/2))^(1/2) -(2-i*3^(1/2))^(1/2) (2-i*3^(1/2))^(1/2)
无解
