■解答
① \(m_1g\) ② \((m_1+m_2)g\) ③ \(\displaystyle\frac{m_1}{m_2}l_1\)
④ ア ⑤ \(3mg\) ⑥ \(\displaystyle\frac{1}{6}l\)
⑦ \(\displaystyle\frac{z}{2}\) ⑧ \(\displaystyle\frac{1}{7}g\) ⑨ \(\displaystyle\frac{3}{2}m\)
⑩ \(\displaystyle\frac{1}{2}l\) ⑪ \(\displaystyle\frac{1}{2}l\)
