(1)(2)(3)(4)(5)

步骤 1：计算 $(-24)\times (+\dfrac {3}{2})+50$
$(-24)\times (+\dfrac {3}{2})+50 = -36 + 50 = 14$

步骤 2：计算 $(-6\dfrac {2}{3})\times \dfrac {3}{5}\div (-4)$
$(-6\dfrac {2}{3})\times \dfrac {3}{5}\div (-4) = (-\dfrac{20}{3})\times \dfrac {3}{5}\div (-4) = -4\div (-4) = 1$

步骤 3：计算 $(-7\dfrac {7}{9})\div (+8-15)$
$(-7\dfrac {7}{9})\div (+8-15) = (-\dfrac{70}{9})\div (-7) = \dfrac{70}{9}\times \dfrac{1}{7} = \dfrac{10}{9}$

步骤 4：计算 $(\dfrac {5}{8}-\dfrac {1}{6}+\dfrac {7}{12})\div (-\dfrac {1}{24})$
$(\dfrac {5}{8}-\dfrac {1}{6}+\dfrac {7}{12})\div (-\dfrac {1}{24}) = (\dfrac{15}{24}-\dfrac{4}{24}+\dfrac{14}{24})\div (-\dfrac {1}{24}) = \dfrac{25}{24}\div (-\dfrac {1}{24}) = -25$

步骤 5：计算 $(-17)\times 1\dfrac {1}{4}+7\times 1.25$
$(-17)\times 1\dfrac {1}{4}+7\times 1.25 = (-17)\times \dfrac{5}{4}+7\times \dfrac{5}{4} = -\dfrac{85}{4}+\dfrac{35}{4} = -\dfrac{50}{4} = -12.5$

步骤 6：计算 $(-96)\div 12-(-16)\times (-5)$
$(-96)\div 12-(-16)\times (-5) = -8-80 = -88$

步骤 7：计算 $(-55)\times (+5\dfrac {2}{3})-(-36)\div (+\dfrac {3}{17})-\dfrac {34}{3}$
$(-55)\times (+5\dfrac {2}{3})-(-36)\div (+\dfrac {3}{17})-\dfrac {34}{3} = (-55)\times \dfrac{17}{3}+36\times \dfrac{17}{3}-\dfrac {34}{3} = -\dfrac{935}{3}+\dfrac{612}{3}-\dfrac{34}{3} = -\dfrac{357}{3} = -119$

步骤 8：计算 $(-|-25|)\div 2\dfrac {1}{2}-(3-\dfrac {1}{3}+1\dfrac {1}{2})\times 6$
$(-|-25|)\div 2\dfrac {1}{2}-(3-\dfrac {1}{3}+1\dfrac {1}{2})\times 6 = -25\div \dfrac{5}{2}-(\dfrac{9}{3}-\dfrac{1}{3}+\dfrac{3}{2})\times 6 = -10-(\dfrac{8}{3}+\dfrac{3}{2})\times 6 = -10-(\dfrac{16}{6}+\dfrac{9}{6})\times 6 = -10-\dfrac{25}{6}\times 6 = -10-25 = -35$