用工具解.8个都是复数根:
X1=0.302231797595725+0.362762017599451i
X2=0.302231797595725-0.362762017599451i
X3=1.35566222061088-1.62717082135077i
X4=1.35566222061088+1.62717082135077i
X5=0.683481106592396-0.729968202685045i
X6=0.683481106592396+0.729968202685045i
X7=-0.841375124799001-0.540451569864929i
X8=-0.841375124799001+0.540451569864929i