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r=3π/2π
r=3/2
trzeba policzyc polowe objetosci kuli o promioniu 3/2
1/2V=1/2(4/3razyπr^3)
1/2 V=2/3 π(3/2)^3=2/3π27/8=9/4π
potrzeba 9/4π m^3 ziemi