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A+b+c=78 a+b=42 b+c=48 va rogggg ma ajutati

Răspuns :

a=78-48=30
b=42-30=12
c=48-12=36
DECI A+B+C=
A= 78-48=30 
B= 42-30=12
C=48-12=38 
A,B.C