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1.计算：$\frac{5}{31} × (-\frac{2}{9}) × (-\frac{31}{15}) × (-\frac{9}{2}).$
答案
1.$-\frac{1}{3}$
2. 计算：$( \dfrac{1}{4} - \dfrac{1}{6} + \dfrac{1}{24} ) × (-48).$
答案
2.$-6$
3.计算：$4×(-\dfrac{27}{7})-3×(-\dfrac{27}{7})-6×\dfrac{27}{7}$
答案
3.$-27$
4. 计算：$( \dfrac{1}{6} - \dfrac{2}{7} + \dfrac{2}{3} ) ÷ ( -\dfrac{5}{42} ).$
答案
4.$-\frac{23}{5}$
5. 计算：$-\dfrac{3}{8} ÷ \dfrac{3}{5} × \dfrac{5}{3}$
答案
5.$-\frac{25}{24}$
6. 计算：$-1^2 - (-\dfrac{1}{2})^3 ÷ 4.$
答案
6.$-\frac{31}{32}$
7.计算：$(-24)÷(\dfrac{1}{3}-\dfrac{1}{8}-\dfrac{1}{6}).$
答案
7.$-576$
