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b=5cm=0,5dm
h=10cm=1dm
a]pojemność 1 pojemnika;
v=abh=0,5²×1=0,25dm³=0,25 litra
b]⅘h=⅘×1dm=⅘dm
do każdego pojemnika nalano:
v=abh=0,5²×⅘=0,2 dm³=0,2 litra
c]ilość pojemników:
3l=3dm³
3:0,2=15