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s1 - s2 = 3
.
L1 - L2 = 234 ---> 6(s1² - s1²) = 234
s1² - s2² = 234/6 = 39
,
s1² - s2² = (s1 - s2)(s1+s2)
39 = 3(s1+s2)
s1 + s2 = 13
..
s1 + s2 = 13
s1 - s2 = 3
eliminasikan
2 s1 = 16 --> s1 = 8 dan s2 = 5
.
V1 - V2 = s1³ -s2³ = (8³ -5³) = 387