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120= V
Pp= e*f/2
Pp= 8*10/2= 40 cm kwadratowych
120 = 1/3*40* H /: 13 i 1/3
H= 9 cm
Pp= 8*10/2= 40
H=x
V=1/3Pp*h
120= 1/3*40*x
360= 40x
x=9cm
Pp=(10*8):2=40
120=40*H
H=120:40
H=30