一、填空题
1. $57+(-36)+(-57)=$
2. $93+(-35)+(-58)=$
3. $27.86+(-100)+(-25.86)=$
4. $31+(-28)+69+28=$
5. $(-17.9)+8.7+12.9+(-1.7)=$
6. $-1\dfrac{2}{13}+(+\dfrac{5}{8})+(-\dfrac{11}{13})+\dfrac{3}{8}=$

1. -36
2. 0
3. -98
4. 100
5. 2
6. -1

二、计算题
7. $(-3)+40+(-31)+(-9)$
8. $11 \frac{3}{7}+(-4 \frac{4}{5})+22 \frac{4}{7}+(-2 \frac{1}{5})$
9. $(-23)+|-47|+|-53|+(-177)$
10. $(-4.73)+(-3 \frac{3}{4})+5.73+1.75$
11. $72 \frac{3}{8}+(-26.5)+3 \frac{4}{9}+(-1.375)+2 \frac{5}{9}$
12. $(-3 \frac{5}{6})+12 \frac{11}{23}+(-3 \frac{3}{14})+(+17 \frac{12}{23})+(-2 \frac{1}{6})$
13. 一题多解 $(-8 \frac{4}{7})+21 \frac{3}{8}+(-2 \frac{1}{7})+(+35 \frac{5}{8})+(-1 \frac{2}{7})$

7. -3
8. 27
9. -100
10. -1
11. 50.5
12. $20\dfrac{11}{14}$
13. $(-8 \dfrac{4}{7})+21 \dfrac{3}{8}+(-2 \dfrac{1}{7})+(+35 \dfrac{5}{8})+(-1 \dfrac{2}{7})= [ (-8 \dfrac{4}{7})+(-2 \dfrac{1}{7})+(-1 \dfrac{2}{7}) ] + [ 21 \dfrac{3}{8}+(+35 \dfrac{5}{8}) ] = (-12)+57=45.$
解法二 $(-8 \dfrac{4}{7}) + 21 \dfrac{3}{8} + (-2 \dfrac{1}{7}) + (+35 \dfrac{5}{8}) + (-1 \dfrac{2}{7}) = (-8+21-2+35-1) + ( -\dfrac{4}{7}+\dfrac{3}{8}-\dfrac{1}{7}+\dfrac{5}{8}-\dfrac{2}{7} ) =45+0=45.$