一、填空题
1. $(-5)+(+15)=$
2. $0-(-5)=$
3. $(-3\ \frac{5}{7})-(+6\ \frac{2}{7})=$
4. $(-3\ \frac{1}{2})-(-4\ \frac{1}{2})=$
5. $(+3\ \frac{1}{2})+(-8\ \frac{1}{6})=$
6. $(-7\ \frac{3}{4})+(+5.4)=$
7. $(+16)-($ $)=-21$
8. $(+3\ \frac{3}{4})+($ $)=-2\ \frac{1}{2}$

1. 10 2. 5 3. -10 4. 1 5. $-4\dfrac{2}{3}$ 6. $-\dfrac{47}{20}$ 7. 37 8. $-6\dfrac{1}{4}$

二、计算题
9. $8+(-2)-(+4)+1-(+3)$
10. $-11+21-(-4)+|-5|$
11. $(-0.25)-(-5\dfrac{1}{2})+3.5-9\dfrac{3}{4}$
12. 一题多解 $-15+9\dfrac{3}{5}+(-8)-(-\dfrac{2}{5})$
13. $(-26.54)-(+6.4)-(-18.54)+6.4$
14. $0.25-(-7\dfrac{1}{2})+(-2\dfrac{1}{4})-1.5-2.75$
15. $(+0.125)-(-3\dfrac{3}{4})+(-3\dfrac{1}{8})-(-10\dfrac{2}{3})-(+1.25)$
16. $12\dfrac{1}{4}-(+1.75)-(-5\dfrac{1}{2})+(-7.25)-(-2\dfrac{3}{4})-2.5$

9. 0
10. 19
11. -1
12. 解法一 原式$=-15+9\dfrac{3}{5}-8+\dfrac{2}{5}=-5\dfrac{2}{5}-8+\dfrac{2}{5}=-13\dfrac{2}{5}+\dfrac{2}{5}=-13.$
解法二 原式$=-15+9\dfrac{3}{5}-8+\dfrac{2}{5}=(-15-8)+(9\dfrac{3}{5}+\dfrac{2}{5})=-23+10=-13.$
13. -8
14. $\dfrac{5}{4}$
15. $10\dfrac{1}{6}$
16. 9