Răspuns:
a) 6
b) 6
c) 4
Explicație pas cu pas:
a)
AM/AB = MN/BC
6/8 = 3/x
6x = 24
x = 6
b)
15/20 = x/8
20x = 120
c)
AN/AC = MN/BC
x/(x+1) = 4/5
5x = 4x + 4
5x - 4x = 4
x = 4
