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H=30cm V=?
a=4m
b=3m
V₁=4m*3m*0,3m
V₁=3,6m³
a₁=3,6m
b₁=2,6
V²=3,6m*2,6m*0,3m
V₂=2,808m³
V=V₁-V₂
V=3,6m³-2,6m³
V=0,792m³
Odp;Na wykonanie piaskownicy zużyto 0,792m³ betonu.