1. 想一想，填一填。
（）个$\frac{1}{8}$是$\frac{7}{8}$ $\frac{10}{15}$里面有（）个$\frac{1}{3}$
$5=\frac{(\ )}{1}=\frac{(\ )}{3}$ $\frac{3}{12}=(\ )÷ 60=\frac{1}{(\ )}$
（）个$\frac{1}{8}$是$\frac{7}{8}$ $\frac{10}{15}$里面有（）个$\frac{1}{3}$
$5=\frac{(\ )}{1}=\frac{(\ )}{3}$ $\frac{3}{12}=(\ )÷ 60=\frac{1}{(\ )}$
答案：7
2
5
15
15
4
2
5
15
15
4
2. 在$◯$里填“$＞$”“$＜$”或“$=$”。
$\frac{7}{9}◯\frac{7}{12}$ $\frac{3}{8}◯\frac{5}{12}$ $\frac{9}{10}◯\frac{3}{10}$
$\frac{5}{4}◯1.3$ $0.55◯\frac{11}{20}$ $\frac{5}{6}◯\frac{6}{7}$
$\frac{7}{9}◯\frac{7}{12}$ $\frac{3}{8}◯\frac{5}{12}$ $\frac{9}{10}◯\frac{3}{10}$
$\frac{5}{4}◯1.3$ $0.55◯\frac{11}{20}$ $\frac{5}{6}◯\frac{6}{7}$
答案：＞
＜
＞
＜
=
＜
＜
＞
＜
=
＜
3. 计算下面各题。（能简便计算的要简便计算）
$\frac{5}{6}+\frac{4}{9}$ $\frac{5}{9}-\frac{2}{5}$ $\frac{8}{9}-\frac{1}{6}+\frac{2}{3}$
$\frac{2}{3}-(\frac{1}{4}+\frac{1}{8})$ $\frac{5}{6}+\frac{2}{7}+\frac{1}{6}$ $\frac{2}{7}+\frac{5}{8}+\frac{2}{8}+\frac{5}{7}$
$\frac{15}{2}×\frac{5}{9}$ $\frac{5}{6}×\frac{4}{3}×\frac{9}{10}$
$\frac{5}{6}+\frac{4}{9}$ $\frac{5}{9}-\frac{2}{5}$ $\frac{8}{9}-\frac{1}{6}+\frac{2}{3}$
$\frac{2}{3}-(\frac{1}{4}+\frac{1}{8})$ $\frac{5}{6}+\frac{2}{7}+\frac{1}{6}$ $\frac{2}{7}+\frac{5}{8}+\frac{2}{8}+\frac{5}{7}$
$\frac{15}{2}×\frac{5}{9}$ $\frac{5}{6}×\frac{4}{3}×\frac{9}{10}$
答案：$=\frac {15}{18}+\frac {8}{18}$
$=\frac {23}{18}$
$=\frac {25}{45}-\frac {18}{45}$
$=\frac {7}{45}$
$=\frac {16}{18}-\frac {3}{18}+\frac {12}{18}$
$=\frac {25}{18}$
$=\frac {2}{3}-\frac {3}{8}$
$=\frac {16}{24}-\frac {9}{24}$
$=\frac {7}{24}$
$=(\frac {5}{6}+\frac {1}{6})+\frac {2}{7}$
$=1+\frac {2}{7}$
$=\frac {9}{7}$
$=\frac {2}{7}+\frac {5}{7}+\frac {5}{8}+\frac {2}{8}$
$=1+\frac {7}{8}$
$=1 \frac {7}{8}$
$=\frac {5}{6}×\frac {9}{10}×\frac {4}{3}$
$=\frac {3}{4}×\frac {4}{3}$
=1
$=\frac {15×5}{2×9}$
$=\frac {25}{6}$
$=\frac {23}{18}$
$=\frac {25}{45}-\frac {18}{45}$
$=\frac {7}{45}$
$=\frac {16}{18}-\frac {3}{18}+\frac {12}{18}$
$=\frac {25}{18}$
$=\frac {2}{3}-\frac {3}{8}$
$=\frac {16}{24}-\frac {9}{24}$
$=\frac {7}{24}$
$=(\frac {5}{6}+\frac {1}{6})+\frac {2}{7}$
$=1+\frac {2}{7}$
$=\frac {9}{7}$
$=\frac {2}{7}+\frac {5}{7}+\frac {5}{8}+\frac {2}{8}$
$=1+\frac {7}{8}$
$=1 \frac {7}{8}$
$=\frac {5}{6}×\frac {9}{10}×\frac {4}{3}$
$=\frac {3}{4}×\frac {4}{3}$
=1
$=\frac {15×5}{2×9}$
$=\frac {25}{6}$