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Pa*b
a=x
b=80%x=0.8x
7.2=x*0.8*x
x^2=7.2:0.8
x^2=9/pierw.
x=3
a=3
b=0.8*3=2.4
L=2*a+2*b
L= 2*3+2*2.4
L= 6+4.8
L=10.8m
Odp. potrzeba 10.8m siatki