525525/252525×525252/2522
=(525525x525252)/(252525x252252)[分子和分母同时除以10101]
=(525525X52)/(25X252252)[分子和分母同时除以25]
=(21021X52)/252252[分子和分母同时除以21021]
=52/12
=13/3
525525/252525×525252/252252
=21021*25/10101*25×131313*4/63063*4
=21021/10101×131313/21021*3
=131313/10101*3
=13*10101/10101*3
=13/3
252525X252252/525525X525252
=25X10101X252X1001/525X1001X52X10101
=25X252/525X52
=252/21X52
=4X63/21X13X4
=3/13