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v = a*b*c
7 dm * 5 dm * 3 dm = 105 dm = 105 l
odp : Trzeba wlać 105 l wody ;)
b=50 cm
H=40cm
V=a x b x H
V= 70 x 50 x 40
V= 140000 cm³
¾ x 14 0000= 105000 cm³=105 l
b=50 cm
c=40 cm
V = a*b*c
V = 70 * 50 * 40
V = 140000 cm[3]
140000 * 3/4 = 42000/4 = 105000 cm[3]
105000 cm[3] = 105 dm[3] = 105 l
odp. Ala musi wlać do akwarium 105 litrów wody.