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determinati a,b,c,stiind ca sunt direct proportionale cu  3,11,5 si 3a plus b plus2c egal 300

Răspuns :

a/3=b/11=c/5=k ⇒ a=3k, b=11k, c=5k
3a+b+2c=300 ⇒ 9k+11k+10k=300, k=10
a=3k=30, b=11k=110, c=5k=50.