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15mm=0,15dm
V=PpH
V=5000000dm2*0,15dm
V=750000dm3=750000l
750000l:11l=68182
s=5ha=50000m²
V=s*h==0,015m*50000m²=750m³
11l=11dcm³=0,011m³
n=750m³/0,011m³=68182 wiaderka