第103页

信息发布者:
27
6
25
0.6
7
3
30
5
12
5
2
3
1800
7
20
20
7
$\boldsymbol{\frac{3}{8}}$
$\boldsymbol{\frac{64}{125}}$
$\boldsymbol{\frac{256}{625}}$
$\boldsymbol{\frac{1}{81}}$
$\boldsymbol{\frac{1}{8}}$
​$ D$​
​$ A$​
​$ D$​
​$=3×\frac {8}{21}$​
​$=\frac {8}{7}$​
​$=\frac {7}{8}-\frac {3}{8}-\frac {2}{5}$​
​$=\frac {1}{2}-\frac {2}{5}$​
​$=\frac {1}{10}$​
​$=(\frac {5}{9}-\frac {4}{9})+(\frac {3}{10}+\frac {7}{10})$​
​$=\frac {1}{9}+1$​
​$=1\frac {1}{9}$​
​$=(\frac {7}{12}×\frac {5}{14})×\frac {24}{25}$​
​$=\frac {5}{24}×\frac {24}{25}$​
​$=\frac {1}{5}$​