Răspuns
Explicație pas cu pas:
a/x = 3
x/a = 1/3 = y/b = z/c
a = 3x; b = 3y; c = 3z
a + b + c = 3x + 3y + 3z = 3(x + y + z)
(a + b + c) / (x + y + z) = 3
___________
2a + 3b + 4c = 6x + 9 y + 12z = 3 (2x + 3y + 4z)
(2a + 3b + 4c) / (2x + 3y + 4z) = 3
_______________
x^2 + y^2 + z^2 = a^2/9 + b^2/9 + c^2/9 = (a^2 + b^2 + c^2)/9
(x^2 + y^2 + z^2) / (a^2 + b^2 + c^2) = 1/9