Odpowiedzi

2009-05-11T18:08:14+02:00
Pb=2cm*3,5cm+2cm*4,5cm+2cm*2,5cm=
=7cm+9cm+5cm= 21cm^2
2009-05-11T18:09:09+02:00
4,5x2=9
3,5x2=7
2,5x2=5
Pb=9+7+5
Pb=21cm²