题目

One Tuesday evening in the beginning of the fall 1996 semester at Shippensburg University, sirens(警笛) sounded.These sirens were not in celebration; they were a cry to the university that something was wrong.A house, only one block away, was on fire.Nine of the university's students lived there. From the minute the word got out that help was needed, it seemed like everyone showed up.The victims of the fire were offered endless invitations for housing for the night.The very next day, everyone got into gear to do their part in helping them.Flyers (小传单) were posted with items that8．计算：①-14-$\frac{1}{6}$×[2-（-3）2]÷（-7）②（1$\frac{1}{2}$-$\frac{5}{8}$+$\frac{7}{12}$）÷（-$\frac{1}{24}$）-8×（-$\frac{1}{2}$）3．