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P=6*a^2
P=726cm2
6*a^2=726
a^2=726/6
a^2=121
a=11
V=a^3
V=11^3
V=1331cm^3
b)
V=a*b*h
V=9*6*3
V=162m^3=162000dm^3
m=d*V
m=1,29g/dm^3 * 162000dm^3=208908g=208,908 kg
c)
V=a*b*h
a= 25m
b= 12m
h=?
Vw=480m^3
25*12*h=480
300*h=480
h=480/300
h=1,6m - głębokość
pozdrawiam:)