推 newfamous:真的能用！ 感謝～ 03/04 16:57
※ 引述《g9661527 (...)》之銘言：
: 假設想排出下式
: 1
: a = {－
: 2
: + b }
: ---------------------------------------------
: \usepackage{amsmath}
: \begin{align}
: a = & \left\{ \frac{1}{2} \right. \\
: & \left. + b \right\}
: \end{align}
: ----------------------------------------------
: 以上會讓上下兩個括號大小不一樣
: 但是如果把 \right. 和 \left. 去掉的話會出錯
: 請問有什麼辦法可以讓上下兩個括號大小一樣嗎？
: 謝謝，感激不盡
a = & \left\{ \frac{1}{2} \right. \\
& \left. + b \vphantom{\frac 1 2}\right\}
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