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Stiind ca : a+b=5
               b+c=2 
Aflati: 5a+7b+2c
Va rog Ajutati-maa !!!



Răspuns :

a+b=5 Ix5
b+c=2 Ix2
5a+5b+2b+2c=25+4
5a+7b+2c=29
a+b=5 I ori 5
b+c=2 I ori 2
5a+5b+2b+2c=25+4
5a+7b+2c=29