第52页 - 苏教版数学补充习题五年级上下册答案

$2 \div 3=\frac {2}{3}，$$ 3 \div 5=\frac {3}{5}$

$\frac {2}{3}=\frac {10}{15}，$$ \frac {3}{5}=\frac {9}{15}$

$\frac {2}{3}>\frac {3}{5}$

$3 \div 4=\frac {3}{4}，$$ 5 \div 8=\frac {5}{8}$

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

$\frac {3}{4}>\frac {5}{8}$

$7 \div 6=\frac {7}{6}，$$ 6 \div 5=\frac {6}{5}$

$\frac {7}{6}=\frac {35}{30}，$$ \frac {6}{5}=\frac {36}{30}$

$\frac {6}{5}>\frac {7}{6}$

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$\frac {3}{4}=\frac {30}{40}，$$ \frac {4}{5}=\frac {32}{40}，$$ \frac {5}{8}=\frac {25}{40}$

$\frac {4}{5}>\frac {3}{4}>\frac {5}{8}$

$\frac {1}{3}=\frac {5}{15}，$$ \frac {2}{5}=\frac {6}{15}$

$\frac {1}{3}<\frac {2}{5}$

答 ∶ 第一台收割机工作效率高一些。