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第70页

信息发布者：

$\frac {3}{8}，\frac {3}{7}，\frac {6}{11}，\frac {3}{4}$

$\frac {5}{9}$

$\frac {1}{6}，\frac {1}{5}，\frac {4}{13}$

$2\frac 18$

$1\frac 45$

$5\frac 79$

$4\frac 7{20}$

0.375

0.71

0.8

1.17

$\frac {5}{8}$

$\frac {3}{2}$

$\frac {7}{20}$

$5\frac 6{25}$

$\frac {2}{3}$

$\frac {4}{5}$

$\frac {1}{3}$

$\frac {3}{4}$

$\begin {aligned}&\frac {2}{3}=\frac {10}{15}，\frac {3}{5}=\frac {9}{15}\\&\frac {10}{15}>\frac {9}{15}，\frac {2}{3}>\frac {3}{5}\end {aligned}$

$\begin {aligned}&\frac {7}{12}=\frac {21}{36}，\frac {5}{9}=\frac {20}{36}\\&\frac {21}{36}>\frac {20}{36}，\frac {7}{12}>\frac {5}{9}\end {aligned}$

$\begin {aligned}&\frac {7}{18}=\frac {14}{36}，\frac {5}{12}=\frac {15}{36}\\&\frac {14}{36}<\frac {15}{36}，\frac {7}{18}<\frac {5}{12}\end {aligned}$

$\frac {2}{5}$ < $\frac {5}{8}$ < $\frac {3}{4}$

$\frac {3}{4}$ < $\frac {4}{5}$ < $\frac {6}{7}$

15÷60=$\frac {1}{4}$

答：鹅的只数占鸡的$\frac {1}{4}。$

(20+15)÷(60+20+15)=$\frac {7}{19}$

答：一共占家禽总数的$\frac {7}{19}。$