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计算:
(1)$(-3\frac {2}{3})-(-2\frac {3}{4})+3\frac {2}{3}-(+5.75)$; (2)$-5.4+0.2-0.6+1.8$;
(3)$-\frac {1}{2}+(-\frac {1}{6})-(-\frac {1}{4})-(+\frac {2}{3})$; (4)$\vert -2\frac{1}{2}\vert -(-2.5)+1-\vert 1-2\frac{1}{2}\vert$;
(5)$8+(-\frac {1}{4})-5-(-0.25)$; (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)$1-3+5-7+9-11+... +97-99$.
(1)$(-3\frac {2}{3})-(-2\frac {3}{4})+3\frac {2}{3}-(+5.75)$; (2)$-5.4+0.2-0.6+1.8$;
(3)$-\frac {1}{2}+(-\frac {1}{6})-(-\frac {1}{4})-(+\frac {2}{3})$; (4)$\vert -2\frac{1}{2}\vert -(-2.5)+1-\vert 1-2\frac{1}{2}\vert$;
(5)$8+(-\frac {1}{4})-5-(-0.25)$; (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)$1-3+5-7+9-11+... +97-99$.
答案：
(1)-3
(2)-4
(3)$-\frac{13}{12}$
(4)$4\frac{1}{2}$
(5)3
(6)8.9
(7)0
(8)-50
(1)-3
(2)-4
(3)$-\frac{13}{12}$
(4)$4\frac{1}{2}$
(5)3
(6)8.9
(7)0
(8)-50
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