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Ldt043128
a fost răspuns

Aflati a+b+c daca 4*a+3*b+c=54 si 2*a+3*b+5*c=66

Răspuns :

Robe17
4a+3b+c=54
2a+3b+5c=66
4a+2a+3b+3b+c+5c=66+54
6a+6b+6c=66+54
6 (a+b+c)=120
a+b+c=120÷6
a+b+c=20

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