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V=525 cm³
1/5*525=105 cm³ - objętość kamienia
a=7cm
b=5cm
c=15cm •1/5
c=3cm
V=7cm•5cm•3cm=105cm³
na 100 dobrze
Pp= a x b=7cm x 5cm=35cm2
V=35cm2 x 15 cm=525cm3 x 1/5=105cm3=0.105l-objętość