1/3+1/5+2/15=(5+3+2)/15=10/15=2/3
1/2+2/3+1/6=(3+4+1)/6=8/6=4/3
1/4+2+1/2=(1+8+2)/4=11/4
2/5+1/4+3/2=(8+5+30)/20=43/20
11/3+2+21/4=(44+24+63)/4=131/4
5+11/8+21/2=(40+11+84)/8=135/8
21/4+51/3+1=(63+204+12)/12=279/12=93/4
Am facut cateva, spune-mi daca ai inteles ca ti le scriu si pe restul imediat. Am adus totul la numitor comun si apoi le-am adunat.