huà jiǎn / zhè ge / biǎo dá shì / shí / xiān / bǎ / kuò hào / lǐ / de / chéng fǎ / suàn / chū lái

化简这个表达式时，先把括号里的乘法算出来。

When simplifying this expression, calculate the multiplication inside the parentheses first.