Question

Determina numerele naturale a,b,c,stiind ca: a+b=100,b+c=110,a+c=90

Answer 1

a + b = 100

b + c = 110

a + c = 90

a + b + b + c = 100 + 110

a + 2 × b + c = 210

90 + 2 × b = 210

2 × b = 210 - 90

2 × b = 120

b = 120 : 2

b = 60

a = 100 - b

a = 100 - 60

a = 40

c = 90 - a

c = 90 - 40

c = 50