Răspuns :
5-(4/7-1/14)= - amplificam 4/7 cu 2
5-(8/14-1/14)=
5-7/14=
5-1/2= - amplificam 5 cu 2
10/2-1/2= 9/2
/- supra
5-(8/14-1/14)=
5-7/14=
5-1/2= - amplificam 5 cu 2
10/2-1/2= 9/2
/- supra