第49页 - 练习与测试五年级数学苏教版彩色版

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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：第二组植树的速度快一些。

$\frac 16$

$\frac {5}{24}$

$\frac 38$

$\frac {5}{12}$

$7÷5=1\frac 25($个)

$9÷6=1\frac 12($个)

$13÷7=1\frac 67($个)

$1\frac 67＞1\frac 12＞1\frac 25$

答：杨师傅的工作效率高。

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