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第49页

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$\frac {7}{8}=\frac {7}{8}$

$\frac {3}{4}=\frac {6}{8}$

$\frac {7}{8}＞\frac {3}{4}$

$\frac {5}{6}=\frac {15}{18}$

$\frac {7}{9}=\frac {14}{18}$

$\frac {5}{6}＞\frac {7}{9}$

$\frac {11}{5}=\frac {77}{35}$

$\frac {15}{7}=\frac {75}{35}$

$\frac {11}{5}＞\frac {15}{7}$

$\frac {9}{10}=\frac {27}{30}$

$\frac {9}{10}＞\frac {23}{30}$

$\frac {5}{8}=\frac {35}{56}$

$\frac {6}{7}=\frac {48}{56}$

$\frac {5}{8}＜\frac {6}{7}$

$\frac {3}{10}=\frac {6}{20}$

$\frac {1}{4}=\frac {5}{20}$

$\frac {3}{10}＞\frac {1}{4}$

$3÷8=\frac {3}{8}=\frac {9}{24}$

$5÷6=\frac {5}{6}=\frac {20}{24}$

$\frac {3}{8}＜\frac {5}{6}$

$9÷4=\frac {9}{4}=\frac {45}{20}$

$11÷5=\frac {11}{5}=\frac {44}{20}$

$\frac {9}{4}＞\frac {11}{5}$

$3÷5=\frac {3}{5}=\frac {27}{45}$

$4÷9=\frac {4}{9}=\frac {20}{45}$

$\frac {3}{5}＞\frac {4}{9}$

$9÷10=\frac {9}{10}=\frac {54}{60}$

$11÷12=\frac {11}{12}=\frac {55}{60}$

$\frac {11}{12}＞\frac {9}{10}$

$30÷18= \frac {5}{3}($分)

$18÷12= \frac {3}{2}($分)

$ \frac {5}{3}＞ \frac {3}{2}$

答：第二组植树的速度快一些.

$\frac {1}{6}$

$\frac {5}{24}$

$\frac {3}{8}$

$\frac {5}{12}$

$7÷5= \frac {7}{5}($个)

$9÷6= \frac {3}{2}($个)

$13÷7= \frac {13}{7}($个)

因为$ \frac {13}{7}＞ \frac {3}{2}＞ \frac {7}{5}，$

所以杨师傅的工效最高.

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