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P=a*b
a=15m
x=?
300= 15x |;15
x=20
Jeśłi zwiększymi boki to:
x=20+2=22m
a=15+2=17m
Obw= 2a+2b
Obw= 2*22+2*17= 44+34=78m
Potrzeba kupić 78m siatki.
b = 300:15= 20
2*(15+2+20+2)= 78m