用文字回答习题， 写最简的答案。
 $\frac{1}{2}\ -\ \ \frac{1}{8}\ \ =$  

 $\frac{2}{3}\ -\ \ \frac{1}{6}\ \ =$  

 $\frac{5}{8}\ \ -\ \ \frac{1}{4}\ \ =$  

 $\frac{7}{10}\ \ -\ \ \frac{1}{5}\ \ =$  

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

 $\frac{1}{2}\ \ -\ \ \frac{1}{10}\ \ =$  

 $\frac{5}{6}\ \ -\ \ \frac{1}{2}\ \ =$  

 $\frac{2}{5}\ \ -\ \ \frac{1}{10}\ \ \ =$  

 $\frac{7}{8}\ \ -\ \ \frac{\left(\ \ \ \ \ \ \ \ \right)}{2}\ \ \ =\ \ \frac{3}{8}$  用数字写答案。

 $\frac{4}{5}\ \ -\ \ \frac{\left(\ \ \ \ \ \right)}{\left(\ \ \ \ \ \right)}\ \ =\ \ \frac{1}{2}$