Odpowiedzi

2010-04-14T17:16:36+02:00
Pb = 2 x 12cm x 9cm + 2 x 8cm x 9cm
Pb = 216cm² + 144cm²
Pb = 360cm²
2010-04-14T17:16:53+02:00
Pb=2P₁+2P₂

P₁=12*9
P₁=108

P₂=8*9
P₂=72

Pb=2P₁+2P₂
Pb=2*108+2*72
Pb=216+144
Pb=360