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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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