Question

cat este a,b,c daca:a+b=300,b+c=500,a+c=400

Answer 1

Cercetam prima ecuatie si ultima, scadem ultima din prima => a + c - ( a + b ) = 400 - 300 => c - b = 100, acum lucram cu a doua ecuatie si aceasta noua ecuatie obtinuta, le adunam => c - b + b + c = 100 + 500 => 2*c = 600 => c = 300, deci a + 300 = 400 => a = 100, iar b + 300 = 500 => b = 200

Answer 2

400-300=100 (a) 100+b=300 b=300-100=200 200+c=500 c=300