登录
一、口算。
$\frac {9}{20}-\frac {1}{4}=$
$\frac {5}{9}×\frac {4}{5}=$
$\frac {3}{5}-\frac {1}{3}=$
$\frac {9}{4}×\frac {10}{27}=$
$2÷\frac {4}{5}=$
$\frac {4}{5}×\frac {6}{7}=$
$\frac {5}{6}÷\frac {5}{9}=$
$26×\frac {1}{13}=$
$\frac {5}{17}÷\frac {5}{51}=$
$\frac {5}{12}-\frac {1}{10}=$
$\frac {5}{8}÷\frac {3}{2}=$
$\frac {3}{5}+\frac {1}{10}=$
$\frac {2}{5}÷10=$
$2-\frac {2}{5}=$
$\frac {4}{5}×\frac {3}{8}=$
$\frac {7}{18}÷\frac {5}{9}=$
$\frac {8}{9}×\frac {3}{2}=$
$\frac {8}{27}÷\frac {2}{9}=$
$\frac {5}{6}×\frac {2}{5}=$
$\frac {5}{12}+\frac {2}{5}=$
$\frac {3}{14}×\frac {7}{9}=$
$\frac {9}{20}-\frac {1}{4}=$
$\frac{1}{5}$
$\frac {5}{9}×\frac {4}{5}=$
$\frac{4}{9}$
$\frac {3}{5}-\frac {1}{3}=$
$\frac{4}{15}$
$\frac {9}{4}×\frac {10}{27}=$
$\frac{5}{6}$
$2÷\frac {4}{5}=$
$\frac{5}{2}$
$\frac {4}{5}×\frac {6}{7}=$
$\frac{24}{35}$
$\frac {5}{6}÷\frac {5}{9}=$
$\frac{3}{2}$
$26×\frac {1}{13}=$
2
$\frac {5}{17}÷\frac {5}{51}=$
3
$\frac {5}{12}-\frac {1}{10}=$
$\frac{19}{60}$
$\frac {5}{8}÷\frac {3}{2}=$
$\frac{5}{12}$
$\frac {3}{5}+\frac {1}{10}=$
$\frac{7}{10}$
$\frac {2}{5}÷10=$
$\frac{1}{25}$
$2-\frac {2}{5}=$
$1\frac{3}{5}$
$\frac {4}{5}×\frac {3}{8}=$
$\frac{3}{10}$
$\frac {7}{18}÷\frac {5}{9}=$
$\frac{7}{10}$
$\frac {8}{9}×\frac {3}{2}=$
$\frac{4}{3}$
$\frac {8}{27}÷\frac {2}{9}=$
$\frac{4}{3}$
$\frac {5}{6}×\frac {2}{5}=$
$\frac{1}{3}$
$\frac {5}{12}+\frac {2}{5}=$
$\frac{49}{60}$
$\frac {3}{14}×\frac {7}{9}=$
$\frac{1}{6}$
答案
一、$\frac{1}{5}$ $\frac{4}{9}$ $\frac{4}{15}$ $\frac{5}{6}$ $\frac{5}{2}$ $\frac{24}{35}$ $\frac{3}{2}$ 2 3 $\frac{19}{60}$ $\frac{5}{12}$ $\frac{7}{10}$ $\frac{1}{25}$ $1\frac{3}{5}$ $\frac{3}{10}$ $\frac{7}{10}$ $\frac{4}{3}$ $\frac{4}{3}$ $\frac{1}{3}$ $\frac{49}{60}$ $\frac{1}{6}$
二、计算下面各题,怎样简便就怎样计算。
$\frac {5}{8}÷(\frac {3}{4}+\frac {1}{3})×\frac {4}{5}$
$\frac {7}{2}×\frac {5}{8}-\frac {3}{2}÷\frac {8}{5}$
$(\frac {5}{16}+\frac {5}{6})×48$
$\frac {5}{9}-\frac {1}{6}×\frac {7}{4}-\frac {5}{24}$
$(\frac {7}{8}-\frac {1}{4})×(\frac {1}{2}-\frac {1}{3})$
$[\frac {4}{5}-(\frac {5}{7}-\frac {1}{5})]÷\frac {5}{14}$
$\frac {5}{8}÷(\frac {3}{4}+\frac {1}{3})×\frac {4}{5}$
$\frac {7}{2}×\frac {5}{8}-\frac {3}{2}÷\frac {8}{5}$
$(\frac {5}{16}+\frac {5}{6})×48$
$\frac {5}{9}-\frac {1}{6}×\frac {7}{4}-\frac {5}{24}$
$(\frac {7}{8}-\frac {1}{4})×(\frac {1}{2}-\frac {1}{3})$
$[\frac {4}{5}-(\frac {5}{7}-\frac {1}{5})]÷\frac {5}{14}$
答案
二、$\frac{6}{13}$ $\frac{5}{4}$ 55 $\frac{1}{18}$ $\frac{5}{48}$ $\frac{4}{5}$
解析
$\frac{5}{8}÷(\frac{3}{4}+\frac{1}{3})×\frac{4}{5}$
$=\frac{5}{8}÷(\frac{9}{12}+\frac{4}{12})×\frac{4}{5}$
$=\frac{5}{8}÷\frac{13}{12}×\frac{4}{5}$
$=\frac{5}{8}×\frac{12}{13}×\frac{4}{5}$
$=\frac{5}{8}×\frac{4}{5}×\frac{12}{13}$
$=\frac{1}{2}×\frac{12}{13}$
$=\frac{6}{13}$
$\frac{7}{2}×\frac{5}{8}-\frac{3}{2}÷\frac{8}{5}$
$=\frac{7}{2}×\frac{5}{8}-\frac{3}{2}×\frac{5}{8}$
$=(\frac{7}{2}-\frac{3}{2})×\frac{5}{8}$
$=2×\frac{5}{8}$
$=\frac{5}{4}$
$(\frac{5}{16}+\frac{5}{6})×48$
$=\frac{5}{16}×48+\frac{5}{6}×48$
$=15 + 40$
$=55$
$\frac{5}{9}-\frac{1}{6}×\frac{7}{4}-\frac{5}{24}$
$=\frac{5}{9}-\frac{7}{24}-\frac{5}{24}$
$=\frac{5}{9}-(\frac{7}{24}+\frac{5}{24})$
$=\frac{5}{9}-\frac{12}{24}$
$=\frac{5}{9}-\frac{1}{2}$
$=\frac{10}{18}-\frac{9}{18}$
$=\frac{1}{18}$
$(\frac{7}{8}-\frac{1}{4})×(\frac{1}{2}-\frac{1}{3})$
$=(\frac{7}{8}-\frac{2}{8})×(\frac{3}{6}-\frac{2}{6})$
$=\frac{5}{8}×\frac{1}{6}$
$=\frac{5}{48}$
$[\frac{4}{5}-(\frac{5}{7}-\frac{1}{5})]÷\frac{5}{14}$
$=[\frac{4}{5}-\frac{5}{7}+\frac{1}{5}]÷\frac{5}{14}$
$=[(\frac{4}{5}+\frac{1}{5})-\frac{5}{7}]÷\frac{5}{14}$
$=[1-\frac{5}{7}]÷\frac{5}{14}$
$=\frac{2}{7}÷\frac{5}{14}$
$=\frac{2}{7}×\frac{14}{5}$
$=\frac{4}{5}$
$=\frac{5}{8}÷(\frac{9}{12}+\frac{4}{12})×\frac{4}{5}$
$=\frac{5}{8}÷\frac{13}{12}×\frac{4}{5}$
$=\frac{5}{8}×\frac{12}{13}×\frac{4}{5}$
$=\frac{5}{8}×\frac{4}{5}×\frac{12}{13}$
$=\frac{1}{2}×\frac{12}{13}$
$=\frac{6}{13}$
$\frac{7}{2}×\frac{5}{8}-\frac{3}{2}÷\frac{8}{5}$
$=\frac{7}{2}×\frac{5}{8}-\frac{3}{2}×\frac{5}{8}$
$=(\frac{7}{2}-\frac{3}{2})×\frac{5}{8}$
$=2×\frac{5}{8}$
$=\frac{5}{4}$
$(\frac{5}{16}+\frac{5}{6})×48$
$=\frac{5}{16}×48+\frac{5}{6}×48$
$=15 + 40$
$=55$
$\frac{5}{9}-\frac{1}{6}×\frac{7}{4}-\frac{5}{24}$
$=\frac{5}{9}-\frac{7}{24}-\frac{5}{24}$
$=\frac{5}{9}-(\frac{7}{24}+\frac{5}{24})$
$=\frac{5}{9}-\frac{12}{24}$
$=\frac{5}{9}-\frac{1}{2}$
$=\frac{10}{18}-\frac{9}{18}$
$=\frac{1}{18}$
$(\frac{7}{8}-\frac{1}{4})×(\frac{1}{2}-\frac{1}{3})$
$=(\frac{7}{8}-\frac{2}{8})×(\frac{3}{6}-\frac{2}{6})$
$=\frac{5}{8}×\frac{1}{6}$
$=\frac{5}{48}$
$[\frac{4}{5}-(\frac{5}{7}-\frac{1}{5})]÷\frac{5}{14}$
$=[\frac{4}{5}-\frac{5}{7}+\frac{1}{5}]÷\frac{5}{14}$
$=[(\frac{4}{5}+\frac{1}{5})-\frac{5}{7}]÷\frac{5}{14}$
$=[1-\frac{5}{7}]÷\frac{5}{14}$
$=\frac{2}{7}÷\frac{5}{14}$
$=\frac{2}{7}×\frac{14}{5}$
$=\frac{4}{5}$
