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Alinalexandra5
a fost răspuns

1.daca a+b=25 si b+c=35,calculati 3a+6b+3c
va rog repede :))))))

Răspuns :

3a+6b+3c=3a+3b+3b+3c=3(a+b)+3(b+c)=3·25+3·35=75+105=180
HawkEyed
a + b + b + c = 25 + 35 
a + 2b + c = 60  / x3 
3a + 6b + 3c = 180 

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