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18=d=a/2
18=a/2
18:/2=a
(18:/2)*(/2:/2)=a (usuwamy niewymierność z mianownika)
6/2=a
Pp=6/2 * 6/2=72
18:2=6
62+x2=152
36+x2=225
x2=189
x=3/21
V=1/3(jedna trzecia) * 72*3/21=72/21