Question

Aflati 3 nr nat a,b,c stiind ca a+b=38 ,a+c=42 si b+c=54
Va rog repede

Answer 1

b+c=54; b=54-c

a+c=42; c=42-a

a+b=38; a+(54-c)=38; a+[54-(42-a)]=38; a+54-42+a=38; a+12+a=38; 2a=38-12; 2a=26; a=26:2; a=13

a+c=42; 13+c=42; c=42-13; c=29

b+c=54; b+29=54; b=54-29; b=25