登录
一、口算。
$\frac {1}{8}×\frac {5}{4}=$
$\frac {7}{16}+\frac {3}{4}=$
$12×\frac {5}{8}=$
$2-\frac {8}{5}=$
$\frac {33}{35}÷22=$
$\frac {2}{3}÷\frac {2}{9}=$
$15÷\frac {3}{5}=$
$\frac {3}{4}×\frac {16}{15}=$
$\frac {4}{5}-\frac {7}{10}=$
$\frac {5}{8}÷\frac {5}{7}=$
$\frac {5}{8}÷\frac {3}{2}=$
$9×\frac {5}{9}=$
$\frac {1}{16}÷\frac {1}{12}=$
$\frac {2}{3}+\frac {1}{8}=$
$\frac {7}{8}×\frac {8}{7}=$
$\frac {3}{4}-\frac {1}{3}=$
$\frac {5}{12}×\frac {4}{15}=$
$\frac {2}{3}÷\frac {3}{4}=$
$\frac {2}{3}÷5=$
$\frac {1}{20}+\frac {5}{16}=$
$\frac {7}{12}-\frac {3}{8}=$
$\frac {1}{8}×\frac {5}{4}=$
$\frac{5}{32}$
$\frac {7}{16}+\frac {3}{4}=$
$\frac{19}{16}$
$12×\frac {5}{8}=$
$\frac{15}{2}$
$2-\frac {8}{5}=$
$\frac{2}{5}$
$\frac {33}{35}÷22=$
$\frac{3}{70}$
$\frac {2}{3}÷\frac {2}{9}=$
$3$
$15÷\frac {3}{5}=$
$25$
$\frac {3}{4}×\frac {16}{15}=$
$\frac{4}{5}$
$\frac {4}{5}-\frac {7}{10}=$
$\frac{1}{10}$
$\frac {5}{8}÷\frac {5}{7}=$
$\frac{7}{8}$
$\frac {5}{8}÷\frac {3}{2}=$
$\frac{5}{12}$
$9×\frac {5}{9}=$
$5$
$\frac {1}{16}÷\frac {1}{12}=$
$\frac{3}{4}$
$\frac {2}{3}+\frac {1}{8}=$
$\frac{19}{24}$
$\frac {7}{8}×\frac {8}{7}=$
$1$
$\frac {3}{4}-\frac {1}{3}=$
$\frac{5}{12}$
$\frac {5}{12}×\frac {4}{15}=$
$\frac{1}{9}$
$\frac {2}{3}÷\frac {3}{4}=$
$\frac{8}{9}$
$\frac {2}{3}÷5=$
$\frac{2}{15}$
$\frac {1}{20}+\frac {5}{16}=$
$\frac{29}{80}$
$\frac {7}{12}-\frac {3}{8}=$
$\frac{5}{24}$
答案
一、$\frac{5}{32}$ $\frac{19}{16}$ $\frac{15}{2}$ $\frac{2}{5}$ $\frac{3}{70}$ $3$ $25$ $\frac{4}{5}$ $\frac{1}{10}$ $\frac{7}{8}$ $\frac{5}{12}$ $5$ $\frac{3}{4}$ $\frac{19}{24}$ $1$ $\frac{5}{12}$ $\frac{1}{9}$ $\frac{8}{9}$ $\frac{2}{15}$ $\frac{29}{80}$ $\frac{5}{24}$
二、计算下面各题,怎样简便就怎样计算。
$\frac {20}{13}÷7+\frac {1}{7}×\frac {6}{13}$
$34-34×\frac {16}{17}$
$\frac {5}{6}×\frac {6}{5}-\frac {9}{10}÷\frac {9}{5}$
$[2-(\frac {1}{4}+\frac {1}{8})]÷\frac {5}{4}$
$(\frac {2}{5}+\frac {3}{8})÷(\frac {9}{10}-\frac {1}{2})$
$\frac {5}{18}×(\frac {11}{24}+\frac {1}{8})÷\frac {5}{6}$
$\frac {20}{13}÷7+\frac {1}{7}×\frac {6}{13}$
$34-34×\frac {16}{17}$
$\frac {5}{6}×\frac {6}{5}-\frac {9}{10}÷\frac {9}{5}$
$[2-(\frac {1}{4}+\frac {1}{8})]÷\frac {5}{4}$
$(\frac {2}{5}+\frac {3}{8})÷(\frac {9}{10}-\frac {1}{2})$
$\frac {5}{18}×(\frac {11}{24}+\frac {1}{8})÷\frac {5}{6}$
答案
二、$\frac{2}{7}$ $2$ $\frac{1}{2}$ $\frac{13}{10}$ $\frac{31}{16}$ $\frac{7}{36}$
解析
$\frac{20}{13}÷7+\frac{1}{7}×\frac{6}{13}$
$=\frac{20}{13}×\frac{1}{7}+\frac{1}{7}×\frac{6}{13}$
$=\frac{1}{7}×(\frac{20}{13}+\frac{6}{13})$
$=\frac{1}{7}×\frac{26}{13}$
$=\frac{1}{7}×2$
$=\frac{2}{7}$
$34 - 34×\frac{16}{17}$
$=34×(1-\frac{16}{17})$
$=34×\frac{1}{17}$
$=2$
$\frac{5}{6}×\frac{6}{5}-\frac{9}{10}÷\frac{9}{5}$
$=1-\frac{9}{10}×\frac{5}{9}$
$=1 - \frac{1}{2}$
$=\frac{1}{2}$
$[2-(\frac{1}{4}+\frac{1}{8})]÷\frac{5}{4}$
$=[2-(\frac{2}{8}+\frac{1}{8})]×\frac{4}{5}$
$=(2 - \frac{3}{8})×\frac{4}{5}$
$=\frac{13}{8}×\frac{4}{5}$
$=\frac{13}{10}$
$(\frac{2}{5}+\frac{3}{8})÷(\frac{9}{10}-\frac{1}{2})$
$=(\frac{16}{40}+\frac{15}{40})÷(\frac{9}{10}-\frac{5}{10})$
$=\frac{31}{40}÷\frac{4}{10}$
$=\frac{31}{40}×\frac{10}{4}$
$=\frac{31}{16}$
$\frac{5}{18}×(\frac{11}{24}+\frac{1}{8})÷\frac{5}{6}$
$=\frac{5}{18}×(\frac{11}{24}+\frac{3}{24})×\frac{6}{5}$
$=\frac{5}{18}×\frac{14}{24}×\frac{6}{5}$
$=\frac{5}{18}×\frac{7}{12}×\frac{6}{5}$
$=\frac{5}{18}×\frac{6}{5}×\frac{7}{12}$
$=\frac{1}{3}×\frac{7}{12}$
$=\frac{7}{36}$
$=\frac{20}{13}×\frac{1}{7}+\frac{1}{7}×\frac{6}{13}$
$=\frac{1}{7}×(\frac{20}{13}+\frac{6}{13})$
$=\frac{1}{7}×\frac{26}{13}$
$=\frac{1}{7}×2$
$=\frac{2}{7}$
$34 - 34×\frac{16}{17}$
$=34×(1-\frac{16}{17})$
$=34×\frac{1}{17}$
$=2$
$\frac{5}{6}×\frac{6}{5}-\frac{9}{10}÷\frac{9}{5}$
$=1-\frac{9}{10}×\frac{5}{9}$
$=1 - \frac{1}{2}$
$=\frac{1}{2}$
$[2-(\frac{1}{4}+\frac{1}{8})]÷\frac{5}{4}$
$=[2-(\frac{2}{8}+\frac{1}{8})]×\frac{4}{5}$
$=(2 - \frac{3}{8})×\frac{4}{5}$
$=\frac{13}{8}×\frac{4}{5}$
$=\frac{13}{10}$
$(\frac{2}{5}+\frac{3}{8})÷(\frac{9}{10}-\frac{1}{2})$
$=(\frac{16}{40}+\frac{15}{40})÷(\frac{9}{10}-\frac{5}{10})$
$=\frac{31}{40}÷\frac{4}{10}$
$=\frac{31}{40}×\frac{10}{4}$
$=\frac{31}{16}$
$\frac{5}{18}×(\frac{11}{24}+\frac{1}{8})÷\frac{5}{6}$
$=\frac{5}{18}×(\frac{11}{24}+\frac{3}{24})×\frac{6}{5}$
$=\frac{5}{18}×\frac{14}{24}×\frac{6}{5}$
$=\frac{5}{18}×\frac{7}{12}×\frac{6}{5}$
$=\frac{5}{18}×\frac{6}{5}×\frac{7}{12}$
$=\frac{1}{3}×\frac{7}{12}$
$=\frac{7}{36}$
