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2x+2x-80=480
2x+2y=480
4x=560
x=140
y=100
P=140*100=14000 m2
OBW= 480m x -krótszy bok
x=40m
Szukane
P= powierzchnia
y= y- dłuższy bok
WZÓR:
P=x*y
P=40*200=8000m2 = 8km2