1、(- 13)+(-20)+(-2)=-35

2、3+ 13-(-7)+6=29

3、(-2)-8- 14- 13=-37

4、(-7)+(- 1)+8=0

5、(- 1 1)+4-(- 18)= 1 1

6、4+(- 1 1)-(-3)=-4

7、(- 17)-6-(- 18)=-5

8、5+7+(- 1)-(-8)= 19

9、(- 1)—(- 1)+ 15+ 1= 16

10、3-(-5)+(- 15)=-7

1 1、(- 14)-(- 14)+(- 13)=- 13

12、(- 13)-(- 17)-(-4)=8

13、(-20)+ 1 1=-9

14、8+(- 1)+(-4)=3

15、(- 13)-(-9)+(- 12)=- 16

16、(- 1)+4* 19+(-2)=73

17、(- 17)*(-9)-20+(-6)= 127

18、(-5)-(- 16)+(- 15)=-4

19、(-3)-(-5)* 13=62

20、5+(-7)+ 17- 10=5

2 1、(- 10)-(- 16)- 13=-7

22、(- 14)+4- 19- 12=-4 1

23、5* 13+ 14+(- 10)=69

24、3* 1* 17+(- 10)=4 1

25、6+(- 12)+ 15-(- 15)=24

26、 13+(-7)=6

27、(- 10)* 1-(-8)=-2

28、(- 19)+(- 14)-5=-38

29、 19- 16+ 18=2 1

30、 19+(-5)+ 1= 15

Extended data:

Rational number is the collective name of integer (positive integer, 0, negative integer) and fraction, and it is the set of integer and fraction.

Real numbers that are not rational numbers are called irrational numbers, that is, the fractional part of irrational numbers is infinite cyclic numbers. It is one of the important contents in the field of number and algebra, and it is widely used in real life. It is the basis for continuing to learn real numbers, algebraic expressions, equations, inequalities, rectangular coordinate systems, functions, statistics and other mathematical contents and related disciplines.

The set of rational numbers can be represented by the capital black orthographic symbol Q, but Q does not represent rational numbers. The set of rational numbers and rational numbers are two different concepts. The set of rational numbers is the set of all rational numbers, and rational numbers are all elements in the set of rational numbers.

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