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 about the equation solve, this simple complex equation can be solve with Solve, while the domains of a and b must be added. In[152]:= Solve[{a + b I - 2 + 3 I == 0.0 + 0.0 I, -100 < a < 100, -100 < b < 100}, {a, b}] \:6B63\:5728\:8BA1\:7B97In[152]:= Solve::ratnz: Solve ??????????????. ???????????????????????????. >> Out[152]= {{a -> 2., b -> -3.}}  but if the equation is not an simple one, like follows equal to zero, how can I use solve to get the solution? {-(((0.0545683 - 0.00208937 I) E^((0. - 1.*10^-7 I) Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2]) (0. - (4.36692 - 0.145345 I) Sqrt[ 8.89495*10^11 - 1. (k1 + I k2)^2] + 1. Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2]) ((-4.36692 + 0.145345 I) Sqrt[(9.29602*10^11 + 6.66186*10^10 I) - (k1 + I k2)^2] + (2735/2617 + (196 I)/ 2617) Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2]))/(Sqrt[8.89495*10^11 - 1. (k1 + I k2)^2] Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2])) - ((0.0545683 - 0.00208937 I) E^((0. + 1.*10^-7 I) Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2]) (0. - (4.36692 - 0.145345 I) Sqrt[ 8.89495*10^11 - 1. (k1 + I k2)^2] - 1. Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2]) ((4.36692 - 0.145345 I) Sqrt[(9.29602*10^11 + 6.66186*10^10 I) - (k1 + I k2)^2] + (2735/2617 + (196 I)/ 2617) Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2]))/(Sqrt[8.89495*10^11 - 1. (k1 + I k2)^2] Sqrt[(-3.88435*10^12 + 1.29283*10^11 I) + (1.58739 - 0.0532404 I) (k1 + I k2)^2])}  i also want to solve a11==0 the values of k1 and k2, k1 and k2 are real. how to do it?is there any other way to solve this?