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Daca a+b=20 si b+c=30 atunci a+2b+3c este.. Am nevoie urgent!

Răspuns :

a+b=20,b+c=30
a+b+b+c+c+c=20+30+2c=50+2c
20+2*30+3*30=20+6-+90=170 ...eu stiu ca intre 2 si b trebe inmultire si la 3c :D