Răspuns:
Explicație pas cu pas:
l--------l----------------------------l
A -P -B
-
AP+AB=135 cm
AP/PB=2/7
2PB/7+⁷⁾PB= ⁷⁾135
2PB+7AB=945
9PB=945
PB=945:9
PB= 105cm
AP=135-105
AP=30 cm
-
b)
AP/PB=5/4
AP+PB=135
AP=5PB/4
5PB/4+⁴⁾PB=⁴⁾ 135
5PB+4PB= 540
9PB=540
PB=540:9
PB= 60 cm
AP= 135-70
AP=75 cm
