答案:环数(mm)环数(mm)2m(mm)(mm)n(mm)(mm)5529.76518.93110.8343028.41720.2788.13951.13251.5190.283867.675029.52619.11010.4162528.17720.0137.46352.797895.924529.26319.4299.8342027.72520.9636.76250.982865.134028.99819.6929.3061527.29921.3885.91151.660876.633528.70119.9728.7291026.82221.8565.01751.025865.86