Răspuns :
{x,y,z{d.p. {2,3,4}
x/2 = y/3 = z/4 = k
x = 2k ; y = 3k ; z=4k
2x + y + 5z=81
2×2k + 3k + 5×4k = 81
27 k = 81⇒ k = 3
x = 2×3 = 6; y = 3×3 = 9 ; z = 4k = 4×3 = 12
x = 6 , y = 9 si z = 12
x/2 = y/3 = z/4 = k
x = 2k ; y = 3k ; z=4k
2x + y + 5z=81
2×2k + 3k + 5×4k = 81
27 k = 81⇒ k = 3
x = 2×3 = 6; y = 3×3 = 9 ; z = 4k = 4×3 = 12
x = 6 , y = 9 si z = 12