第19页 - 通城学典课时作业本五年级数学苏教版江苏专用

3.111

2.16

$\frac {13}{20}$

$1\frac {12}{25}$

$\frac {10}{25}=\frac 25$，$\frac {39}{65}=\frac 35$，$\frac {57}{38}=\frac 32$，$\frac {13}{91}=\frac 17$

$\frac {5}{7}=\frac {15}{21}$

$\frac {2}{3}=\frac {14}{21}$

$\frac {7}{12}=\frac {14}{24}$

$\frac {5}{8}=\frac {15}{24}$

$\frac {13}{12}=\frac {65}{60}$

$\frac {6}{5}=\frac {72}{60}$

$\frac {1}{2}=\frac {6}{12}$

$\frac {9}{4}=\frac {27}{12}$

$\frac {11}{6}=\frac {22}{12}$

不变

改变

9

10

12

3

4

1

4