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a=2
np. b=1 →Ob=6
np. b=1/2 →Ob=5
x ∈ <1,2>
Obw = 2(x + 2cm) = 2x + 4cm
Możliwość 1.
x = 1 cm
Obw = 6cm
Możliwość 2.
x = 2cm
Obw = 8cm
Ob.=2+2+a+a
Ob.=4+2a