2009-II-07

21-06-2023 app.cch 尚無留言

答案：B

\begin{array}{rcl} \frac{[(x + 6) + (2 x + 3)] \times 8}{2} & = & 96 \\ 4 (x + 6 + 2 x + 3) & = & 96 \\ 3 x + 9 & = & 24 \\ 3 x & = & 15 \\ x & = & 5 \end{array}