Question

Află valorile lui abc știind că a+b+c=69 a+b=21 a+c=59 b+c=58

Answer 1

a+b+c=69
a+b=21
_______
21+c=69 => c=48 ●

a+b+c=69
a+c=59
_______
b+59=69 => b=10 ●

a+b+c=69
b=10
c=48
a+10+48=69 => a= 11 ●

Answer 2

a+b+c=69
a+b=21
21+c=69=>c=69-21=>c=48

59+b=69=>b=69-59=>b=10

a+58=69=>a=69-58=>a=11