252525*252252除以525525*525252
252525=25*10101 252252=252*1001 525525=525*1001 525252=52*10101 252525*252252=25*10101*252*1001 525525*525252=525*1001*52*10101 所以 252525*252252除以525525*525252 =25*252除以52*525 =25*(4*3*21)除以(25*21)*(4*13) =3/13