1. 计算:
(1) $(-21)÷7 - (-4)×\frac{1}{64}$;
(2) $56×(-\frac{3}{4}) - (-\frac{2}{5})÷(-0.4)$;
(3) $-48×(-3)×(-0.5) + 15÷(-2.4)$;
(4) $-4\frac{1}{8}÷1\frac{1}{32} - (-1\frac{1}{2})÷(-2\frac{2}{9})×(-2\frac{2}{3})$。
(1) $(-21)÷7 - (-4)×\frac{1}{64}$;
(2) $56×(-\frac{3}{4}) - (-\frac{2}{5})÷(-0.4)$;
(3) $-48×(-3)×(-0.5) + 15÷(-2.4)$;
(4) $-4\frac{1}{8}÷1\frac{1}{32} - (-1\frac{1}{2})÷(-2\frac{2}{9})×(-2\frac{2}{3})$。
答案
(1) $-\frac{47}{16}$
(2) $-43$
(3) $-78\frac{1}{4}$
(4) $-\frac{11}{5}$
(2) $-43$
(3) $-78\frac{1}{4}$
(4) $-\frac{11}{5}$
2. 计算:
(1) $( \frac{1}{6} - \frac{2}{7} + \frac{2}{3} ) ÷ ( -\frac{5}{42} )$;
(2) $( 1\frac{3}{4} - \frac{7}{8} - \frac{7}{12} ) ÷ ( -\frac{7}{8} )$;
(3) $( 3\frac{1}{3} - 2\frac{1}{2} + 1\frac{3}{7} ) ÷ ( -1\frac{3}{7} )$;
(4) $[ ( -\frac{1}{2} ) - ( -\frac{1}{4} ) + ( -\frac{2}{5} ) - \frac{3}{20} ] ÷ ( -\frac{1}{60} )$。
(1) $( \frac{1}{6} - \frac{2}{7} + \frac{2}{3} ) ÷ ( -\frac{5}{42} )$;
(2) $( 1\frac{3}{4} - \frac{7}{8} - \frac{7}{12} ) ÷ ( -\frac{7}{8} )$;
(3) $( 3\frac{1}{3} - 2\frac{1}{2} + 1\frac{3}{7} ) ÷ ( -1\frac{3}{7} )$;
(4) $[ ( -\frac{1}{2} ) - ( -\frac{1}{4} ) + ( -\frac{2}{5} ) - \frac{3}{20} ] ÷ ( -\frac{1}{60} )$。
答案
(1) $-\frac{23}{5}$
(2) $-\frac{1}{3}$
(3) $-\frac{19}{12}$
(4) $48$
(2) $-\frac{1}{3}$
(3) $-\frac{19}{12}$
(4) $48$
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