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计算：
(1)$3÷ \left(-\dfrac{3}{10}\right)÷ \dfrac{5}{12}$； (2)$\left(-\dfrac{7}{4}\right)× \left(-\dfrac{1}{5}\right)÷ \left(-\dfrac{7}{5}\right)$；
(3)$(-3.5)÷ \dfrac{7}{8}× \left(-\dfrac{3}{4}\right)$； (4)$1÷ \left(-\dfrac{4}{3}\right)× \left(-\dfrac{3}{4}\right)$；
(5)$(-2.1)÷ \dfrac{7}{10}× \left(-\dfrac{10}{7}\right)$； (6)$-8÷ (-4)× \dfrac{4}{15}$；
(7)$0÷ (-5)× 100+(-3)÷ (-7)$； (8)$\left(-\dfrac{1}{2}+\dfrac{1}{6}-\dfrac{3}{8}+\dfrac{5}{24}\right)÷ \left(-\dfrac{1}{24}\right)$.
(1)$3÷ \left(-\dfrac{3}{10}\right)÷ \dfrac{5}{12}$； (2)$\left(-\dfrac{7}{4}\right)× \left(-\dfrac{1}{5}\right)÷ \left(-\dfrac{7}{5}\right)$；
(3)$(-3.5)÷ \dfrac{7}{8}× \left(-\dfrac{3}{4}\right)$； (4)$1÷ \left(-\dfrac{4}{3}\right)× \left(-\dfrac{3}{4}\right)$；
(5)$(-2.1)÷ \dfrac{7}{10}× \left(-\dfrac{10}{7}\right)$； (6)$-8÷ (-4)× \dfrac{4}{15}$；
(7)$0÷ (-5)× 100+(-3)÷ (-7)$； (8)$\left(-\dfrac{1}{2}+\dfrac{1}{6}-\dfrac{3}{8}+\dfrac{5}{24}\right)÷ \left(-\dfrac{1}{24}\right)$.
答案：
(1)-24
(2)$-\frac{1}{4}$
(3)3
(4)$\frac{9}{16}$
(5)$\frac{30}{7}$
(6)$\frac{8}{15}$
(7)$\frac{3}{7}$
(8)12
(1)-24
(2)$-\frac{1}{4}$
(3)3
(4)$\frac{9}{16}$
(5)$\frac{30}{7}$
(6)$\frac{8}{15}$
(7)$\frac{3}{7}$
(8)12
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