电子课本网 第86页

第86页

信息发布者:
7
2
5
15
15
4
=
​$=\frac {15}{18}+\frac {8}{18}$​
​$=\frac {23}{18}$​
​$=\frac {25}{45}-\frac {18}{45}$​
​$=\frac {7}{45}$​
​$=\frac {16}{18}-\frac {3}{18}+\frac {12}{18}$​
​$=\frac {25}{18}$​
​$=\frac {2}{3}-\frac {3}{8}$​
​$=\frac {16}{24}-\frac {9}{24}$​
​$=\frac {7}{24}$​
​$=(\frac {5}{6}+\frac {1}{6})+\frac {2}{7}$​
​$=1+\frac {2}{7}$​
​$=\frac {9}{7}$​
​$=\frac {2}{7}+\frac {5}{7}+\frac {5}{8}+\frac {2}{8}$​
​$=1+\frac {7}{8}$​
​$=1 \frac {7}{8}$​
​$=\frac {5}{6}×\frac {9}{10}×\frac {4}{3}$​
​$=\frac {3}{4}×\frac {4}{3}$​
​$=1$​
​$=\frac {15×5}{2×9}$​
​$=\frac {25}{6}$​