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计算:
(1)$10-(-6)+8-(+2)$; (2)$-17+(-6)+23-(-20)$;
(3)$4.7-(-8.9)-7.5+(-6)$; (4)$-72+(-32)+(-8)+72$;
(5)$-7+(-33)-10-(-16)$; (6)$12-(-18)+(-7)-20$;
(7)$2\frac {2}{3}+6.3-(\frac {5}{3}-1\frac {3}{5})$; (8)$\frac {5}{6}+(-\frac {3}{4})-(+0.25)-(-\frac {1}{6})$;
(9)$1-3+5-7+9-11+... +97-99$.
(1)$10-(-6)+8-(+2)$; (2)$-17+(-6)+23-(-20)$;
(3)$4.7-(-8.9)-7.5+(-6)$; (4)$-72+(-32)+(-8)+72$;
(5)$-7+(-33)-10-(-16)$; (6)$12-(-18)+(-7)-20$;
(7)$2\frac {2}{3}+6.3-(\frac {5}{3}-1\frac {3}{5})$; (8)$\frac {5}{6}+(-\frac {3}{4})-(+0.25)-(-\frac {1}{6})$;
(9)$1-3+5-7+9-11+... +97-99$.
答案：
(1)22
(2)20
(3)0.1
(4)-40
(5)-34
(6)3
(7)8.9
(8)0
(9)-50
(1)22
(2)20
(3)0.1
(4)-40
(5)-34
(6)3
(7)8.9
(8)0
(9)-50
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