Răspuns:
Explicație pas cu pas:
4
a) NP=MN+5 MN=MP
Pmnp=26 cm=MN+MN+NP=3MN+5=26 ⇒3MN=21 MN=7 cm
MN=MP=7 cm NP=12 cm
b) Pmnp=76 cm NP=5/7MN
Pmnp=2MN+5MN/7=76 (14+5)MN=7·76
19MN=7·4·19 MN=28 cm=MP
NP=5·28/7=5·4=20 cm