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28.4: Асиметричний верх
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\[ \begin{array}{r}\dfrac{L_{1}^{2}}{I_{1}}+\dfrac{L_{2}^{2}}{I_{2}}+\dfrac{L_{3}^{2}}{I_{3}}=2 E \\\dfrac{L_{1}^{2}}{I_{2}}+\dfrac{L_{2}^{2}}{I_{2}}+\dfrac{L_{3}^{2}}{I_{2}}=\dfrac{L^{2}}{I_{2}}=2 E\... $\begin{array}{r}\dfrac{L_{1}^{2}}{I_{1}}+\dfrac{L_{2}^{2}}{I_{2}}+\dfrac{L_{3}^{2}}{I_{3}}=2 E \\\dfrac{L_{1}^{2}}{I_{2}}+\dfrac{L_{2}^{2}}{I_{2}}+\dfrac{L_{3}^{2}}{I_{2}}=\dfrac{L^{2}}{I_{2}}=2 E\end{array}$ $L_{1}^{2}\left(\dfrac{1}{I_{1}}-\dfrac{1}{I_{2}}\right)+L_{3}^{2}\left(\dfrac{1}{I_{3}}-\dfrac{1}{I_{2}}\right)=0$ $L_{1}=\pm c L_{3}, \quad c=I_{1}\left(I_{3}-I_{2}\right) / I_{2}\left(I_{2}-I_{1}\right)$