计算:
(1)$(-20)-(-5)+(-7)$；
(2)$13.2+[(-7.5)-(-6.3)]$；
(3)$(3-5)+(-10\dfrac{1}{2})$；
(4)$(-8\dfrac{1}{2})+(-12)-(-11\dfrac{1}{2})$；
(5)$(-12)-5.5+(-14.5)-(-39)$；
(6)$-2.4+3.54-5.6+3.46$；
(7)$-\dfrac{3}{5}-(-\dfrac{2}{7})+\dfrac{3}{7}+(-\dfrac{2}{5})$；
(8)$(-\dfrac{1}{3})-(-0.4)+(+\dfrac{3}{5})-(+1\dfrac{2}{3})$；
(9)$-(+\dfrac{1}{2})+(-\dfrac{2}{3})-(-1\dfrac{1}{2})-(+2\dfrac{1}{3})$；
(10)$\left|-2\dfrac{1}{4}\right|-(-\dfrac{3}{4})+1-\left|1-\dfrac{1}{2}\right|$.

(1)-22
(2)12
(3)$-12\dfrac{1}{2}$
(4)-9
(5)7
(6)-1
(7)$-\dfrac{2}{7}$
(8)-1
(9)-2
(10)$3\dfrac{1}{2}$