👤

a+b+c=28 a+b=13 b+c=23 algebric


Răspuns :

a+b+c=28
a+b=13
b+c=23
a+23=28
a=28-23
a=5
5+b=13
b=13-5
b=8
8+c=23
c=23-8
c=15