Question

a-b-c=13
a+b=32
3Xb=21
Aflati nr​

Answer 1

Răspuns:

a-b-c=13

a+b=32=>a+7=32=>a=32-7=>a=25

3b=21=>b=21:3=>b=7

25-7-c=13

-c=13+7-25

-c=-5· (-1)

c=5

verificare:25-7-5=13