一、填空题
1. $-1-(-2)+3=$
2. $(-5)-(-4)+(-2)=$
3. $(+3)-(+5)+(-1)=$
4. $0-4+(-5)-(-6)=$
5. $(-9)-4-(-5)+8=$
6. $(-4 \frac{1}{4})-(+5 \frac{1}{3})-(-4 \frac{1}{4})=$
7. $(-5.4)-6+(-3.6)=$
8. $-20.15-18+2.15+(-8)=$

1. 4 2. -3 3. -3 4. -3 5. 0 6. $-5\frac{1}{3}$ 7. -15 8. -44

二、计算题
9. $-7+6+9-8-5$
10. $(+6)-(+12)+(+8.3)-(+7.4)$
11. $11\frac{5}{13}-\frac{10}{17}+(-2\frac{5}{13})$
12. $(+7.2)-(-3.6)+(-3.6)-(-2.8)$
13. $(-\frac{1}{3})-(-\frac{2}{5})+(+\frac{3}{5})-(+1\frac{2}{3})$
14. $-\frac{2}{3}+(-\frac{1}{6})-(-\frac{1}{4})-\frac{1}{2}$
15. $1\frac{3}{4}+(-6.25)-(-\frac{3}{8})-1.75$
16. $-5\frac{5}{6}-9\frac{2}{3}+17.75+(-3.5)$

9. -5 10. -5.1 11. $8\frac{7}{17}$ 12. 10 13. -1 14. $-\frac{13}{12}$ 15. $-\frac{47}{8}$ 16. $-\frac{5}{4}$