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Se dau nr. Reale a,b,c astfel incat a+3b =7 si 2b-5c=9. Determinati :
a+b+5c


Răspuns :

a+3b= 7=> 7-3= 4=> b=4 2b-5c= 9 => 9+5=14=> a= 2•7=14 a+b+5c=> 14+4=> 18+5c=>18+9=> 27