Răspuns:
Explicație pas cu pas:
abab = ab*100 + ab = 101*ab
cdcd = cd*100 + cd = 101*cd
abab/cdcd = 101*ab/101*cd = ab/cd
___________
3131/6262 = 1/2
___________
xy0xy = xy*1000 + xy = 1001*xy
51051 = 51*1000 + 51 = 1001*51 + 51 = 1001*51
xy0xy/51051 = 1001*xy/1001*51 = xy/51
