计算:
(1)$10-(-6)+8-(+2)$;
(2)$-17+(-6)+23-(-20)$;
(3)$4.7-(-8.9)-7.5+(-6)$;
(4)$-7+(-33)-10-(-16)$;
(5)$12-(-18)+(-7)-20$;
(6)$2\frac{2}{3}+6.3-(\frac{5}{3}-1\frac{3}{5})$;
(7)$\frac{5}{6}+(-\frac{3}{4})-(+0.25)-(-\frac{1}{6})$;
(8)$5.6+(-7\frac{3}{5})-(-8.3)-(+\frac{53}{10})-1$;
(9)$1-3+5-7+9-11+\dots+97-99$。
答案:(1)22
(2)20
(3)0.1
(4)-34
(5)3
(6)8.9
(7)0
(8)0
(9)-50