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第49頁(yè)

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?$\frac {7}{8}=\frac {7}{8}，$??$\frac {3}{4}=\frac {6}{8}$?
?$\frac {7}{8}>\frac {6}{8}，$??$\frac {7}{8}>\frac {3}{4}$?
?$\frac {5}{6}=\frac {15}{18}，$??$\frac {7}{9}=\frac {14}{18}$?
?$\frac {15}{18}>\frac {14}{18}，$??$\frac {5}{6}>\frac {7}{9}$?
?$\frac {11}{5}=\frac {77}{35}，$??$\frac {15}{7}=\frac {75}{35}$?
?$\frac {77}{35}>\frac {75}{35}，$??$\frac {11}{5}>\frac {15}{7}$?
?$\frac {9}{10}=\frac {27}{30}，$??$\frac {23}{30}=\frac {23}{30}$?
?$\frac {27}{30}>\frac {23}{30}，$??$\frac {9}{10}>\frac {23}{30}$?
?$\frac {5}{8}=\frac {35}{56}，$??$\frac {6}{7}=\frac {48}{56}$?
?$\frac {35}{56}<\frac {48}{56}，$??$\frac {5}{8}<\frac {6}{7}$?
?$\frac {3}{10}=\frac {6}{20}，$??$\frac {1}{4}=\frac {5}{20}$?
?$\frac {6}{20}>\frac {5}{20}，$??$\frac {3}{10}>\frac {1}{4}$?
?$3÷8=\frac 38，$??$5÷6=\frac 56$?
?$\frac {3}{8}=\frac {9}{24}，$??$\frac {5}{6}=\frac {20}{24}$?
?$\frac {9}{24}<\frac {20}{24}，$??$\frac {3}{8}<\frac {5}{6}$?
?$9÷4=\frac 94，11÷5=\frac {11}{5}$?
?$\frac {9}{4}=\frac {45}{20}，$??$\frac {11}{5}=\frac {44}{20}$?
?$\frac {45}{20}>\frac {44}{20}，$??$\frac {9}{4}>\frac {11}{5}$?
?$3÷5=\frac 35，4÷9=\frac 49$?
?$\frac {3}{5}=\frac {27}{45}，$??$\frac {4}{9}=\frac {20}{45}$?
?$\frac {27}{45}>\frac {20}{45}，$??$\frac {3}{5}>\frac {4}{9}$?
?$9÷10=\frac {9}{10}，11÷12=\frac {11}{12}$?
?$\frac {9}{10}=\frac {54}{60}，$??$\frac {11}{12}=\frac {55}{60}$?
?$\frac {54}{60}<\frac {55}{60}，$??$\frac {9}{10}<\frac {11}{12}$?
?$18÷30=\frac 35($?棵)
?$12÷18=\frac 23($?棵)
?$\frac 35＜\frac 23$?
答：第二組植樹(shù)的速度快一些。
?$\frac 16$?
?$\frac {5}{24}$?
?$\frac 38$?
?$\frac {5}{12}$?
?$7÷5=1\frac 25($?個(gè))
?$9÷6=1\frac 12($?個(gè))
?$13÷7=1\frac 67($?個(gè))
?$1\frac 67＞1\frac 12＞1\frac 25$?
答：楊師傅的工作效率高。
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