Răspuns :
2,12+2,1(3)+2,(12)
212/100+212/90+212/99
212/100 amplificam cu 99
212/90 amplificam cu 110
212/99 amplificam cu 100
212/100=20988/9900
212/90=23328/9900
212/99=21200/9900
20988/9900+23328/9900+21200/9900=
65508/9900
212/100+212/90+212/99
212/100 amplificam cu 99
212/90 amplificam cu 110
212/99 amplificam cu 100
212/100=20988/9900
212/90=23328/9900
212/99=21200/9900
20988/9900+23328/9900+21200/9900=
65508/9900