这个很难给出精确解,我能找到的数值近似解只有这些{x -> -3.04819,y -> -3.86614,z -> -2.42533},{x -> -1.74924,y -> -1.93567,z -> 1.87583},{x -> -0.741927 - 0.314823i,y -> 2.31845 + 0.593102 i,z -> 0.23021...