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Bok=x
Bok=y
P!=x*y
Prostokąt 2
Bok=x+25%x=x+0,25x=1,25x
Bok=y-20%y=y-0,20y=0,80y
P2=1,25x*0,80y
P2=1*x*y
P2=x*y
P1=P2
Odp.
Pole nie zmieni się.
pozdrawiam:)