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a- długosc jednego boku dzialki
5a-dlugosc drugiego boku dzialki
L=a+a+5a+5a
156=12a//:12
a=13m
5a=5*13=65m
P=13*65=845m²
Odp. Pole tej działki wynosi 845m²
a=x
b=5x
2(x+5x)=156
2x+10x=156
12x=156 /:12
x=13m
a=13m
b=13*5
b=65m
P=13*65
P=845m²
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