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计算：
(1)$-2.5÷ \frac {5}{8}× (-\frac {1}{4})$； (2)$25÷ (-5)× \frac {1}{5}÷ (-\frac {3}{4})$；
(3)$12× (-\frac {4}{3})÷ 5$； (4)$-2\frac {1}{5}× 2\frac {3}{11}÷ (-2\frac {1}{2})$；
(5)$(-2.1)÷ \frac {7}{10}× (-\frac {10}{7})$； (6)$-8÷ (-4)× \frac {4}{15}$；
(7)$(-3)× 6÷ (-2)× \frac {1}{2}$； (8)$(-\frac {4}{7})÷ (-\frac {3}{14})× (-\frac {7}{3})$；
(9)$(-3)÷ (+1\frac {3}{4})× 0.75× |-2\frac {1}{3}|÷ 9$； (10)$(-\frac {1}{42})÷ (\frac {1}{6}-\frac {3}{14}+\frac {2}{3}-\frac {2}{7})$.
(1)$-2.5÷ \frac {5}{8}× (-\frac {1}{4})$； (2)$25÷ (-5)× \frac {1}{5}÷ (-\frac {3}{4})$；
(3)$12× (-\frac {4}{3})÷ 5$； (4)$-2\frac {1}{5}× 2\frac {3}{11}÷ (-2\frac {1}{2})$；
(5)$(-2.1)÷ \frac {7}{10}× (-\frac {10}{7})$； (6)$-8÷ (-4)× \frac {4}{15}$；
(7)$(-3)× 6÷ (-2)× \frac {1}{2}$； (8)$(-\frac {4}{7})÷ (-\frac {3}{14})× (-\frac {7}{3})$；
(9)$(-3)÷ (+1\frac {3}{4})× 0.75× |-2\frac {1}{3}|÷ 9$； (10)$(-\frac {1}{42})÷ (\frac {1}{6}-\frac {3}{14}+\frac {2}{3}-\frac {2}{7})$.
答案：
(1)1
(2)$\frac{4}{3}$
(3)$-\frac{16}{5}$
(4)2
(5)$\frac{30}{7}$
(6)$\frac{8}{15}$
(7)$-\frac{9}{2}$
(8)$-\frac{56}{9}$
(9)$-\frac{1}{3}$
(10)$-\frac{1}{14}$
(1)1
(2)$\frac{4}{3}$
(3)$-\frac{16}{5}$
(4)2
(5)$\frac{30}{7}$
(6)$\frac{8}{15}$
(7)$-\frac{9}{2}$
(8)$-\frac{56}{9}$
(9)$-\frac{1}{3}$
(10)$-\frac{1}{14}$
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