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Daca a+b=300 si b+c=138 afla a-c

Răspuns :

a+b=300
b+c=138
300:2=150 (a)
150-138=12 (c)
a-c=150--12=138
a=300-138= 162
c=300-162=138
a-c= 162-138= 24