Question

Aflati 3 numere naturale a,b,c care verifica simultan egalitatile: a+b=80, a+c=90, b+c=100

Answer 1

a + b = 80
a + c = 90
b + c = 100
le adunam
2(a + b+ c) = 270
a + b + c = 270 : 2
a + b + c = 135
80 + c = 135
c = 135 - 80
c = 55
a + 100 = 135
a = 135 - 100
a = 35
b + 90 = 135
b = 135 - 90
b = 45