1. $\frac{1}{2} + \frac{1}{2} =$
2. $\frac{2}{3} + \frac{1}{3} =$
3. $\frac{3}{4} + \frac{1}{4} =$
4. $\frac{1}{4} - \frac{1}{5} =$
5. $\frac{7}{9} - \frac{2}{9} =$
6. $1 - \frac{1}{2} - \frac{1}{5} =$
7. $\frac{1}{5} + \frac{1}{2} - \frac{1}{5} =$
8. $\frac{1}{3} + \frac{5}{3} - 2 =$
9. $\frac{2}{5} + \frac{1}{10} =$
10. $0.3x = 45$
11. $\frac{2}{5}x + \frac{3}{5}x = 28$
12. $x - \frac{4}{5} = \frac{5}{12}$
这些题目涵盖了同分母和异分母分数的加减法,以及分数与整数的混合运算。希望这些题目能帮助你巩固分数加减法的知识。