数式：\left(\frac{x}{y+z}\right)


            <a href="http://exp.frozenlib.net/query?exp=%5cleft(%5cfrac%7bx%7d%7by%2bz%7d%5cright)"><img src="http://exp.frozenlib.net/image?exp=%5cleft(%5cfrac%7bx%7d%7by%2bz%7d%5cright)&amp;size=7&amp;textcolor=000000FF&amp;backcolor=FFFFFFFF" alt="\left(\frac{x}{y+z}\right)" style="border:none;" /></a>

$\left(\frac{x}{y+z}\right)$

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