计算：
(1) $\displaystyle (-5)+(-1\ \frac{1}{3})+(-8\ \frac{2}{3})+6\ \frac{1}{2}$；
(2) $\displaystyle 1.5+4\ \frac{1}{4}+(-2.75)+(-5\ \frac{1}{2})$；
(3) $\displaystyle (-1.3)+(-2\ \frac{1}{5})+1\ \frac{2}{5}+(-3)$；
(4) $\displaystyle (-\frac{3}{5})+(-\frac{1}{3})+3+(-\frac{11}{3})+(-3\ \frac{1}{2})$；
(5) $\displaystyle 1.75+(-6\ \frac{1}{2})+3\ \frac{3}{8}+(-97\ \frac{3}{4})+2\ \frac{5}{8}$；
(6) $\displaystyle (-8\ \frac{1}{6})+\left|-3\ \frac{3}{4}\right|+\left|+2\ \frac{1}{2}\right|+(-1\ \frac{5}{6})$；
(7) $\displaystyle (+2\ \frac{1}{3})+(-10\ \frac{2}{3})+(-8\ \frac{1}{5})+(-3\ \frac{2}{5})$；
(8) $\displaystyle \frac{1}{3}+0.4+\frac{1}{6}+(-12.5\%)+1\ \frac{3}{8}$；
日期 用时 错题数

(1) $-8\dfrac{1}{2}$
(2) -2.5
(3) -5.1
(4) $-5\dfrac{1}{10}$
(5) $-96\dfrac{1}{2}$
(6) $-3\dfrac{3}{4}$
(7) $-19\dfrac{14}{15}$
(8) $\dfrac{43}{20}$