Respuestas
Respuesta:
A) 8
B) 10
Explicación paso a paso:
A.
2x + 4x + x = 56
7x = 56
x = 8
B.
|--------------------------|--------------------------|-----------------------------|
A B C D
/--------- ?? -----------/
/-------------------------18--------------------------/
/-------------------------------26------------------------/
/---------------------------------------34-------------------------------------------/
Se observa que:
AB + BC = 18 .............. (1)
BC + CD = 26 .............. (2)
AB+BC+CD = 34 → AB + CD = 34 - BC .......... (3)
Sumamos (1) con (2):
AB + CD + 2BC = 44
de (3) :
(34- BC) + 2BC = 44
34+BC=44
BC=44-34
BC=10