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Se stie ca a+b=159 si b+c=198, aflati 3a+3b si a+2b+c

Răspuns :

3a + 3b= 3*159=477
a+2b+c=159+198=357
3a+3b=159x3=477
a+2b+c=ab+bc
a+2b+c=159+198=357