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b=0,75a-szerokość
2a+2b=42
b=0,75a
2a+2(0,75a)=42
b=0,75a
2a+1,5a=42
b=0,75a
3,5a=42
b=0,75a
a=12
b=0,75*12
a=12
b=9
P=ab
P=12*9
P=108
Odp. Pole prostokąta wynosi 108.