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4

$\frac{17}{20}$

$\frac{3}{20}$

$\frac{15}{8}$

0.65

0.008

$\frac{9}{5}$

$\frac{10}{7}$

6

$\frac{1}{25}$

$=\frac {4}{9}+\frac {6}{9}$

$=\frac{10}{9}$

$=\frac {3}{17}×(\frac {4}{5}+\frac {1}{5})$

$=\frac {3}{17}×1$

$=\frac{3}{17}$

$=\frac {18}{7}-\frac{1}{2}×\frac{4}{3}-\frac{1}{3}$

$=\frac {18}{7}-\frac{2}{3}-\frac{1}{3}$

$=\frac {18}{7}-(\frac {2}{3}+\frac {1}{3})$

$=\frac {18}{7}-1$

$=\frac{11}{7}$

$解:\frac{1}{12}x=\frac{7}{4}$

$x=\frac{7}{4}×12$

$x=21$

$解:\frac {5}{6}x=\frac {1}{3}+\frac {4}{9}$

$\frac {5}{6}x=\frac {7}{9}$

$x=\frac {7}{9}×\frac {6}{5}$

$x=\frac{14}{15}$

$解:1.6x=\frac{7}{10}$

$x=0.7÷1.6$

$x=\frac{7}{16}$

$=\frac{2}{3}÷(\frac {9}{14}×\frac {7}{18})$

$=\frac {2}{3}÷\frac {1}{4}$

$=\frac {2}{3}×4$

$=\frac{8}{3}$

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