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计算:
(1)$(-3)-(+\frac {1}{3})+5-(-1\frac {1}{3})$; (2)$(-15)+(-3)-(-8)-(+2)$;
(3)$0.25+(-\frac {1}{8})-\frac {3}{4}-|-\frac {7}{8}|$; (4)$(-0.8)+(-1.2)+(-0.6)+(-2.4)$;
(5)$(-8)+(-3\frac {1}{2})+(-\frac {1}{2})+12$; (6)$5\frac {3}{5}+(-5\frac {2}{3})+4\frac {2}{5}+(-\frac {1}{3})$;
(7)$(-6.37)+(-3\frac {3}{4})+6.37+2.75$;
(8)$(-4\frac {7}{9})-(-3\frac {1}{6})-(+\frac {2}{9})+(+6\frac {1}{6})$.
(1)$(-3)-(+\frac {1}{3})+5-(-1\frac {1}{3})$; (2)$(-15)+(-3)-(-8)-(+2)$;
(3)$0.25+(-\frac {1}{8})-\frac {3}{4}-|-\frac {7}{8}|$; (4)$(-0.8)+(-1.2)+(-0.6)+(-2.4)$;
(5)$(-8)+(-3\frac {1}{2})+(-\frac {1}{2})+12$; (6)$5\frac {3}{5}+(-5\frac {2}{3})+4\frac {2}{5}+(-\frac {1}{3})$;
(7)$(-6.37)+(-3\frac {3}{4})+6.37+2.75$;
(8)$(-4\frac {7}{9})-(-3\frac {1}{6})-(+\frac {2}{9})+(+6\frac {1}{6})$.
答案：
(1)3
(2)-12
(3)-1.5
(4)-5
(5)0
(6)4
(7)-1
(8)$4\frac{1}{3}$
(1)3
(2)-12
(3)-1.5
(4)-5
(5)0
(6)4
(7)-1
(8)$4\frac{1}{3}$
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