5.49^(1/3) = 1.7641037161163 54.9^(1/3) = 3.8006462428151 549^(1/3) = 8.1882441100602 5490^(1/3) = 17.641037161163 54900^(1/3) = 38.006462428151.规律是每一项与前一项的比等于后一项和他的比值 5.49的立方...