2018-I-01

13-06-2023 app.cch 尚無留言

答案：

b = \frac{2 a + 5}{3}

\begin{array}{rcl} \frac{a + 4}{3} & = & \frac{b + 1}{2} \\ 2 (a + 4) & = & 3 (b + 1) \\ 2 a + 8 & = & 3 b + 3 \\ 2 a + 5 & = & 3 b \\ 3 b & = & 2 a + 5 \\ b & = & \frac{2 a + 5}{3} \end{array}