Răspuns:
a)AD/ AB = AE / A * C = DE BC
6 / A * B = AE / 8 = 5/10
AB=6^ * 10/5=12
BD = 12 - 6 = 6
AE=8^ * 5/10=4
EC = 8 - 4 = 4
b)AD/AB=AE/AC=DE/I BC
AD = 18 - 12 = 6
6/18 = 9 / A * C = 4 / B * C
BC=4^ * 18/6=12
AC=9^ * 18/6=27
EC = 27 - 9 = 18
c)AD /AB=AE/AC=DE/BC
5/15- AE / 18 = DE / 12
AE=5^ * 18/15=6
DE=5^ * 12/15=4
DB = 15 - 5 = 10
EC = 18 - 6 = 12
d)AD/AB=AE/AC=DE/I BC
AB = 4 + 6 = 10
4/10 = AE / 15 = DE / 18
AE=4^ * 15/10=6
DE=18^ * 4/10=7,2
EC = 15 - 6 = 9
e)AD /AB=AE/AC=DE/BC 2, 5 / A * B = AE / 14 = 4/16
AE=4^ * 14/16=3,5
AB=2,5^ * 16/4=10
DB = 10 - 2, 5 = 7, 5
EC = 14 - 3, 5 = 10, 5