一、填空题
1. $-3 - (-218) =$
2. $-\dfrac{1}{3} + \dfrac{1}{5} =$
3. $(-\dfrac{5}{6}) - (-1\dfrac{4}{5}) =$
4. $(-\dfrac{5}{6}) - (-3) =$
5. $\dfrac{4}{5} + (-\dfrac{1}{3}) =$
6. $\dfrac{5}{8} - (+\dfrac{1}{4}) =$
7. $-3 - (-1\dfrac{3}{4}) =$
8. $|-3| - (-1\dfrac{4}{5}) =$
9. $-3\dfrac{1}{2} - 1\dfrac{3}{4} =$
10. $(-\dfrac{2}{3}) - \left|-\dfrac{1}{12}\right| =$

1. 215
2. $-\dfrac{2}{15}$
3. $\dfrac{29}{30}$
4. $2\dfrac{1}{6}$
5. $\dfrac{7}{15}$
6. $\dfrac{3}{8}$
7. $-1\dfrac{1}{4}$
8. $4\dfrac{4}{5}$
9. $-5\dfrac{1}{4}$
10. $-\dfrac{3}{4}$

二、计算题
11. $7 - (-4) + (-5)$
12. $(-12) - (+8) + (-6) - (-5)$
13. $(-1\ \frac{3}{5}) - (+8\ \frac{3}{4}) + (-6\ \frac{1}{3}) + 5\ \frac{1}{2}$
14. $(-1.2) - (+1.8) + (-2.6) - (-5.1)$
15. $435 - (-21) + (-250) - (+45)$
16. $(-47) - (-66) - (-85) - 167$
17. $(-4\ \frac{1}{3}) - (-5\ \frac{1}{3}) - (-2.85) - (-2\ \frac{17}{20})$
18. $\left|-11\ \frac{6}{11}\right| - (+\frac{3}{5}) - (-12\ \frac{5}{11}) - \left|-7\ \frac{2}{5}\right|$

11. 6
12. -21
13. $-11\dfrac{11}{60}$
14. -0.5
15. 161
16. -63
17. 6.7
18. 16