Question

Daca x+y=17 si x+z=28 si y+z=15 aflati x+y+z

Answer 1

x + y + x + z + y + z =

17 + 28 + 15 = 60

x + y + x + z + y + z =

2x + 2y + 2z = 60

2 (x + y + z) = 60

x + y + z = 60 : 2

x + y + z = 30

Answer 2

x+y=17 x+z=28 y+z=15 x+y+z=?

x+y+x+z+y+z=17+28+15
2x+2y+2z=60
2×(x+y+z)=60
x+y+z=60:2
x+y+z=30

Sper ca te-am ajutat !!