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S1 - S2 = 3
S1 = S2 + 3
6(S1)² - 6(S2)² =234
S1² - S2² =39
(S2 + 3)² - S2² = 39
S2² + 6S2 + 9 - S2² =39
6S2 = 39-9
6S2 = 30
S2 = 5 dm
S1 = 5 + 3 = 8dm
Vol 1 = S1³ = 8³ = 512 dm³
vol 2 = S2³ = 5³ = 125 dm³ -
Selisih ............ 387 dm³