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第13页

信息发布者：

27

24

$\frac{14}{15}$

$\frac{2}{21}$

0

$\frac{2}{3}$

$\frac{1}{30}$

0.027

$\frac{4}{9}$

$\frac{24}{5}$

$=\frac {51}{8}×\frac {4}{17}+\frac {2}{9}$

$=\frac {3}{2}+\frac {2}{9}$

$=\frac {27}{18}+\frac {4}{18}$

$=\frac{31}{18}$

$=\frac {4}{5}÷[(\frac {7}{8}-\frac {3}{4})÷\frac {5}{8}]$

$=\frac {4}{5}÷(\frac {1}{8}÷\frac {5}{8})$

$=\frac {4}{5}÷\frac {1}{5}$

$=4$

$=\frac {4}{3}×(\frac {5}{7}+\frac {2}{7})$

$=\frac {4}{3}×1$

$=\frac{4}{3}$

$=6÷\frac {5}{6}$

$=6×\frac {6}{5}$

$=\frac{36}{5}$

$=4-\frac {16}{21}×\frac {3}{4}-\frac {3}{7}$

$=4-\frac {4}{7}-\frac {3}{7}$

$=4-(\frac {4}{7}+\frac {3}{7})$

$=4-1$

$=3$

$=4.6×\frac{11}{8}+3.4×\frac{11}{8}$

$=(4.6+3.4)×\frac{11}{8}$

$=8×\frac{11}{8}$

$=11$

$解:\frac{1}{2}x=\frac {2}{7}+\frac {3}{4}$

$\frac{1}{2}x=\frac{29}{28}$

$x=\frac {29}{28}×2$

$x=\frac{29}{14}$

$解:20\%x+0.6x=40$

$0.8x=40$

$x=50$

$解:\frac{4}{5}x=\frac{4}{15}$

$x=\frac {4}{15}×\frac {5}{4}$

$x=\frac{1}{3}$

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