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一、填空题
1. $-3-(-9)+(-6)=$
2. $(-6)-(-4)+(-3)-3+4=$
3. $(-30)-12.5+28+(-7.5)=$
4. $(-12)+[6-(-8.16)]=$
5. $-21.56+24-1.56+(-4)=$
6. $(-7)+(-\dfrac{2}{3})-(-3)+(+\dfrac{1}{4})=$
1. $-3-(-9)+(-6)=$
0
2. $(-6)-(-4)+(-3)-3+4=$
-4
3. $(-30)-12.5+28+(-7.5)=$
-22
4. $(-12)+[6-(-8.16)]=$
2.16
5. $-21.56+24-1.56+(-4)=$
-3.12
6. $(-7)+(-\dfrac{2}{3})-(-3)+(+\dfrac{1}{4})=$
$-4\dfrac{5}{12}$
答案
1. 0
2. -4
3. -22
4. 2.16
5. -3.12
6. $-4\dfrac{5}{12}$
2. -4
3. -22
4. 2.16
5. -3.12
6. $-4\dfrac{5}{12}$
二、计算题
7. $(-15)-3.2+(-15)$
8. $10.65+(-0.3)+0.25+(-6.7)$
9. $(-27)+26+(-33)+30-(-26)$
10. $-15+9\frac{3}{5}+(-8)-(-\frac{2}{5})$
11. $\left|-3.5-(-2\frac{1}{2})\right|-(-1\frac{1}{4})$
12. $(-1\frac{1}{3})+(-5.25)+4\frac{1}{9}-(-1.75)-(+3\frac{2}{9})$
13. 易错题 $(+3\frac{2}{5})-(-2\frac{7}{8})-(+3\frac{5}{12})+(-5\frac{3}{5})+(-1\frac{1}{8})-(-5\frac{5}{12})$
7. $(-15)-3.2+(-15)$
8. $10.65+(-0.3)+0.25+(-6.7)$
9. $(-27)+26+(-33)+30-(-26)$
10. $-15+9\frac{3}{5}+(-8)-(-\frac{2}{5})$
11. $\left|-3.5-(-2\frac{1}{2})\right|-(-1\frac{1}{4})$
12. $(-1\frac{1}{3})+(-5.25)+4\frac{1}{9}-(-1.75)-(+3\frac{2}{9})$
13. 易错题 $(+3\frac{2}{5})-(-2\frac{7}{8})-(+3\frac{5}{12})+(-5\frac{3}{5})+(-1\frac{1}{8})-(-5\frac{5}{12})$
答案
7. -33.2
8. 3.9
9. 22
10. -13
11. $2\dfrac{1}{4}$
12. $-3\dfrac{17}{18}$
13. $1\dfrac{11}{20}$
易错分析
13. 带分数拆分后分别运算时,易出现负数符号处理不当的情况导致错误.
8. 3.9
9. 22
10. -13
11. $2\dfrac{1}{4}$
12. $-3\dfrac{17}{18}$
13. $1\dfrac{11}{20}$
易错分析
13. 带分数拆分后分别运算时,易出现负数符号处理不当的情况导致错误.
