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Pb1=5cm*3cm=15 cm2
Pb2=5cm*7cm=35cm2
Pc=Pp*2+Pb1*2+Pb2*2
Pc=142cm2
sądzę ,że dobrze ;/
Pzdr !;]
2x3x5=30
2x7x5=70
42+30+70=142 [jedn. kwadratowych]
P całkowite = 100 + 2*ab = 142 cm.