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4.2*2.5=10.5*1.5=15.75cm3
a = 4,2[cm] ;
b = 2,5[cm] ;
c = 1,5[cm].
Wzór na objętość prostopadłościanu :
V = a*b*c.
Podstawiam:
V = 4,2[cm]*2,5[cm]*1,5[cm] = 15,75[cm3].
Odp . V = 15,75[cm3].