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A

B

D

C

D

$\frac{1}{6}$

$\frac{10}{9}$

4

10

$\frac{1}{3}$

16

$=\frac {7}{20}×(1-\frac{1}{2})$

$=\frac {7}{20}×\frac{1}{2}$

$=\frac{7}{40}$

$=\frac{1}{3}+\frac{5}{6}$

$=\frac{2}{6}+\frac{5}{6}$

$=1\frac{1}{6}$

$=\frac {11}{7}-\frac {5}{7}+\frac {5}{14}$

$=\frac {6}{7}+\frac {5}{14}$

$=1\frac{3}{14}$

$解:\frac{7}{5}x=21$

$x=21×\frac{5}{7}$

$x=15$

$解:\frac{2}{3}x=4$

$x=4×\frac{3}{2}$

$\ x=6\ $

$解:0.85x=1-0.15$

$0.85x=0.85$

$\ x=1$

$解:0.15x=0.15$

$x=1$

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

$=\frac {5}{7}÷\frac{2}{5}$

$=\frac{5}{7}×\frac{5}{2}$

$=\frac{25}{14}$

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