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V=12dm²* 3dm = 36dm³
V=36l
2.
v=pp*h
100l=100dm³
100dm³=pp*4dm |:4dm
25dm²=pp
pp=a²
a²=25dm²
a=5dm
pb=5dm*4dm
pb=20dm²
Pp=12dm^2
H=3dm
V=Pp*H
V=12dm^2*3dm
V=36dm^3
b) H=4dm
Pp=a^2
V=100l=100dm^3
a^2*4dm=100dm^3 |:4dm
a^2=25dm^2
a=5dm
Pp=a^2
Pp=5dm^2
Pp=25dm^2
Pśb=a*H
Pśb=5dm*4dm
Pśb=20dm^2