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

二、计算题
9. $-18+(-14)-(-18)-13$
10. $(+6)-(+12)+(+8.3)-(+7.4)$
11. $-17\frac{1}{5}+42+(-33.8)-(-8)$
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. $\left|-2\frac{1}{2}\right|-(-2.5)+1-\left|1-2\frac{1}{2}\right|$

9. -27 10. -5.1 11. -1 12. 10 13. -1 14. $-\frac{13}{12}$ 15. $-\frac{47}{8}$ 16. 4.5