Question

Prof, hv. primar Uprescu Andreeo, Campulung, Arges
2. Stiind că: a+b+c=20, a+c=12, b+c=13, aflaţi numărul de forma ,cab".
Prof. inv. primar Oprescu Andreea, Câmpulung, Arges
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Answer 1

a+b+c = 20

a+c = 12

b+c = 13

b+(a+c) = 20

b+12 = 20 => b = 8

a+(b+c) = 20

a+13 = 20 => a = 7

a+c = 12 => 7+c = 12 => c = 5

=> cab = 578