第109页

信息发布者:
D
$\frac{2}{3}$
$\frac{2}{5}$
$\frac{2}{3}$
$\frac{4}{5}$
$\frac{2}{3}$
$\frac{2}{3}$
​$ \frac {7}{12}=\frac {35}{60},$​​$\frac {8}{15}=\frac {32}{60}$​
​$ \frac {9}{16}=\frac {27}{48},$​​$\frac {11}{24}=\frac {22}{48}$​
​$ \frac {5}{32}=\frac {45}{288},$​​$\frac {7}{18}=\frac {112}{288}$​
​$ \frac {13}{40}=\frac {65}{200},$​​$\frac {21}{25}=\frac {168}{200}$​
5
4
9
5
4
1
4
5
20
4
5
20
$\frac{1}{5}+\frac{1}{6}=\frac{6+5}{5×6}=\frac{11}{30}$
$\frac{1}{5}-\frac{1}{6}=\frac{6-5}{5×6}=\frac{1}{30}$
​$ 4÷8=\frac {1}{2}$​
​$ 4÷14=\frac {2}{7}$​
​$ \frac {1}{2}=\frac {7}{14},$​​$\frac {2}{7}=\frac {4}{14}$​
​$ \frac {7}{14}>\frac {4}{14},$则​​$\frac {1}{2}>\frac {2}{7}$​
答:客车行了全程的​$\frac {1}{2},$​货车行了全程的​$\frac {2}{7},$​客车速度快。
​$\frac {1}{6}=\frac {10}{60},$​​$\frac {1}{5}=\frac {12}{60},$​​$\frac {11}{60}$​是比​$\frac {1}{6}$​大且比​$\frac {1}{5}$​小的分数
​$ \frac {1}{6}=\frac {15}{90},$​​$\frac {1}{5}=\frac {18}{90},$​则​$\frac {16}{90}=\frac {8}{45},$​​$\frac {17}{90}$​也符合条件。
答:比​$\frac {1}{6}$​大且比​$\frac {1}{5}$​小的分数可以是​$\frac {11}{60},$​还可以是​$\frac {8}{45}、$​​$\frac {17}{90}。$​