Asociază convenabil termeni si calculeaza 11+17+13 ,26+23+24,39+19+41

Răspuns :

11+17+13=11+30=40
26+23+24=23+50=73
39+19+41=80+19=91
17+13=30+11=41
26+24=50+23=73
39+41=80+19=99