1. | \(\dfrac{l_1+l_2}{2}\) | 2. | \(\dfrac{T_2l_1+T_1l_2}{T_1+T_2}\) |
3. | \(\dfrac{T_2l_1-T_1l_2}{T_2-T_1}\) | 4. | \(\dfrac{T_1l_1-T_2l_2}{T_2-T_1}\) |
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