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2r=promień 2 kuli
⁴/₃πr³+⁴/₃π×(2r)³=324π /:π
⁴/₃r³+⁴/₃×8r³=324
12r³=324
r³=324:12
r³=27
r=3cm=promień 1 kuli
v=⁴/₃πr³=⁴/₃π×3³=36πcm³
2r=6cm=promień drugiej kuli
v=⁴/₃πr³=⁴/₃π×6³=288πcm³
spr. 36π+288π=324πcm³