Răspuns:
1/2 amplificam cu 6 =6/12
3/4 amplificam cu 3 =9/12
5/6 amplificam cu 2 =10/12
( 6/12 + 9/12 + 10/12)
1/2 amplificam cu 6 =6/12
1/4 amplificam cu 3 = 3/12
1/6 amplificam cu 2 =2/12
( 6/12 + 3/12 + 2/12) ==>
==> 6/12 + 9/12 + 10/12 + 6/12 + 3/12 + 2/12==>
==> 36/12 simplificam cu 12==> 3/1 = 3
