F₁₃ = F₂₃
G.m₁.m₃/x² = G.m₂.m₃/(r-x)²
m₁/x² = m₂/(r-x)²
(r-x)²/x² = m₂/m₁
{ (r-x)/x }² = 4.m/m
{ (r-x)/x }² = 4
(r-x)/x = 2
r - x = 2.x
r = 3.x
x = r/3
Letak bintang ketiga sejauh r/3 dari bintang kesatu.
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F₁₃ = F₂₃
G.m₁.m₃/x² = G.m₂.m₃/(r-x)²
m₁/x² = m₂/(r-x)²
(r-x)²/x² = m₂/m₁
{ (r-x)/x }² = 4.m/m
{ (r-x)/x }² = 4
(r-x)/x = 2
r - x = 2.x
r = 3.x
x = r/3
Letak bintang ketiga sejauh r/3 dari bintang kesatu.