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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 :

Didi12342
4×a + 3×b+ c = 54
2×a + 3×b+5×c = 66
------------------------------ ( + )
6×a + 6×b + 6×c = 120
6×(a+b+c) = 120
a+b+c = 120 : 6
a+b+c = 20