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3l = 3000cm (3)
x - 3000cm (3)
3000cm (3) / 50cm / 40cm = 1,5cm
Poziom wody obniżył się o 1,5 cm.
1l=1000cm³
3l=3000cm³
V=Pp*h
3000=50*40*h
3000=2000*h
3000/2000=h
h=1,5cm
Odp:O 1.5cm