1.
y = 3 * 4 = 12
x = 5 * 3 = 15
z = 6 * 3 = 18
2.
AC / A₁C₁ = 8/4 = 2
x = 3 * 2 = 6
y = 4 : 2 = 2
3.
AB / A₁B₁ = 12/8 = 3/2 = 1,5
x = 7 * 1,5 = 10,5
y = 5 * 1,5 = 7,5
4.
P(ABC) = 10 + 9 + 8 = 27
P₁ / P = 54 / 27 = 2
x = 10 * 2 = 20
y = 9 * 2 = 18
z = 8 * 2 = 16