Multiplication and division of rational numbers in the first volume of seventh grade mathematics published by People's Education Press.
First, multiple-choice questions (***27 small questions)
The reciprocal of 1 -2 is ()
A.-2 years BC D.-2
2. The reciprocal of-5 is ()
A.-5th century BC
3. The reciprocal of-7 is ()
A.-7th century BC D.-7
4. The reciprocal of ~ 2 is ()
A.-2 BC d 1
The reciprocal of 5.-3 is ()
A.B.﹣3 C.3 D
6. The reciprocal of-6 is ()
A.B.﹣ C.6 D.﹣6
7. The reciprocal of-3 is ()
A.b.3 Area 3
8. The reciprocal of+is equal to ()
A.B.﹣ C.﹣2 D.2
The reciprocal of 9.2 is ()
A.B.﹣ C？ D.2
The reciprocal of 10.3 is ()
A.B.﹣ C.﹣3 D.3
The reciprocal of 1 1. -3 is ()
A.-3rd century BC D.
The reciprocal of 12.205438+04 is ()
A.B.﹣ C.|20 14| D.﹣20 14
/kloc-the reciprocal of 0/3. | Yes ()
A.-4th century BC D.
/kloc-the reciprocal of 0/4. -3 is ()
C.﹣ D.﹣3
15. The reciprocal of ~ 2 is ()
A.B.﹣ C.2 D.﹣2
16. The reciprocal of ~ 6 is ()
A.-6th century BC
17. The reciprocal of ~ 5 is ()
b.﹣5·d.﹣
/kloc-the reciprocal of 0/8. | Yes ()
A.B.﹣2 C.2 D.﹣
/kloc-the reciprocal of 0/9. | Yes ()
B.﹣3 C.﹣ D
The reciprocal of 20 is ()
b.﹣2·d.﹣
The reciprocal of 2 1. rational number is ()
A.b.﹣·d.﹣
22. The reciprocal of-2 is ()
C.﹣ D.﹣0.2
23. The reciprocal of ﹣ is ()
A.﹣3 B.3 C.﹣ D
24. The reciprocal of-7 is ()
C.﹣7 D.﹣
25.If()？ (-2) = 1, then the real number in brackets should be ().
A.B.2 C.﹣2 D.﹣
26. The absolute value of ﹣ is ()
A.﹣3 B.3 C.﹣ D
27. The reciprocal of-4 is ()
A.﹣4 B.4 C.﹣ D
Fill in the blanks (***3 small questions)
The reciprocal of 28.3 is.
The reciprocal of 29 is.
The reciprocal of 30 is.
Multiplication and division of rational numbers in the first volume of seventh grade mathematics published by People's Education Press.
First, multiple-choice questions (***27 small questions)
The reciprocal of 1 -2 is ()
A.-2 years BC D.-2
Test center countdown.
According to the analysis, two numbers whose product is 1 are called reciprocal solutions.
Solution: ∵ (∵ 2)? (﹣ )= 1,
? The reciprocal of 2 is.
So choose a.
This review examines the definition of reciprocal, which is the basic question, and the concept of memory is the key to solving the problem.
2. The reciprocal of-5 is ()
A.-5th century BC
Test center countdown.
Special calculation problems.
Analysis can directly get the answer according to the definition of reciprocal.
Answer: The reciprocal of 5 is.
So choose B.
Comments on this topic examine the definition of reciprocal: a(a? The reciprocal of 0) is.
3. The reciprocal of-7 is ()
A.-7th century BC D.-7
Test center countdown.
Analysis is answered according to the definition of reciprocal.
Solution: Let the reciprocal of ﹣7 be x, then
﹣7x= 1，
The solution is x=﹣.
So choose a.
The review mainly examines the concept and nature of reciprocity. Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
4. The reciprocal of ~ 2 is ()
A.-2 BC d 1
Test center countdown.
Analysis can be solved according to the definition of reciprocal.
Solution: The reciprocal of 2 is.
So choose a.
The review mainly examines the concept and nature of reciprocity. Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
The reciprocal of 5.-3 is ()
A.B.﹣3 C.3 D
Test center countdown.
According to the analysis, two numbers whose product is 1 are reciprocal solutions.
Solution: ∵∶3? (﹣ )= 1,
? The reciprocal of 3 is.
So choose a.
This review examines the definition of reciprocal, which is the basic question, and the concept of memory is the key to solving the problem.
6. The reciprocal of-6 is ()
A.B.﹣ C.6 D.﹣6
Test center countdown.
According to the analysis, two numbers whose product is 1 are called reciprocal solutions.
Solution: ∫ (6)? (﹣ )= 1,
? The reciprocal of 6 is 6.
So choose B.
This review examines the definition of reciprocal, which is the basic question, and the concept of memory is the key to solving the problem.
7. The reciprocal of-3 is ()
A.b.3 Area 3
Test center countdown.
According to the analysis, two numbers whose product is 1 are called reciprocal solutions.
Solution: ∫ (3)? (﹣ )= 1,
? The reciprocal of | 3 is |.
So choose a.
This review examines the definition of reciprocal, and the concept of memory is the key to solving problems.
8. The reciprocal of+is equal to ()
A.B.﹣ C.﹣2 D.2
Test center countdown.
Thematic standard questions.
According to the definition of reciprocal, the reciprocal of-is-2.
The peer of is 2.
So choose: C.
Comments on this topic mainly focus on the definition of reciprocal, which needs to be mastered skillfully. It should be pointed out that:
The nature of reciprocal: the reciprocal of a negative number is negative, the reciprocal of a positive number is positive, and 0 has no reciprocal.
Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
The reciprocal of 9.2 is ()
A.B.﹣ C？ D.2
Test center countdown.
According to the reciprocal of two numbers whose product is 1, we can find the reciprocal of a number.
Solution: The reciprocal of 2 is,
So choose: a.
This topic reviews the reciprocal, and the exchange position of numerator and denominator is the key to find the reciprocal of a number.
The reciprocal of 10.3 is ()
A.B.﹣ C.﹣3 D.3
Test center countdown.
Thematic standard questions.
According to the definition of reciprocal, we can know.
Solution: The reciprocal of 3 is.
So choose: a.
Comments mainly examine the definition of reciprocal, which needs to be mastered. It should be pointed out that:
The nature of reciprocal: the reciprocal of a negative number is negative, the reciprocal of a positive number is positive, and 0 has no reciprocal.
Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
The reciprocal of 1 1. -3 is ()
A.-3rd century BC D.
Test center countdown.
According to the analysis, two numbers whose product is 1 are reciprocal, and the reciprocal of a number can be found.
Solution: The reciprocal of | 3 is |,
Therefore, choose: d.
This topic reviews the reciprocal, and the exchange position of numerator and denominator is the key to find the reciprocal of a number.
The reciprocal of 12.205438+04 is ()
A.B.﹣ C.|20 14| D.﹣20 14
Test center countdown.
The analysis is solved according to the definition of reciprocity.
Solution: The reciprocal of 20 14 is.
So choose: a.
The review of this topic mainly investigates the definition of reciprocal, and the key to solving the problem is the definition of memory.
/kloc-the reciprocal of 0/3. | Yes ()
A.-4th century BC D.
Test center countdown.
Thematic standard questions.
According to the analysis that the reciprocal of a negative number is negative, it can be directly solved by the definition of reciprocal.
Solution: It is the reciprocal of 4.
So choose: a.
This topic review examines the definition of reciprocity, and understanding the definition is the key.
/kloc-the reciprocal of 0/4. -3 is ()
C.﹣ D.﹣3
Test center countdown.
Thematic standard questions.
The analysis uses the definition of reciprocal to get the result directly.
Solution: ∵∶3? (﹣ )= 1,
? The reciprocal of 3 is.
So choose: C.
Comments mainly examine the definition of reciprocal, which needs to be mastered. What needs to be noted is a negative number or the reciprocal of a negative number.
Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
15. The reciprocal of ~ 2 is ()
A.B.﹣ C.2 D.﹣2
Test center countdown.
According to the definition of reciprocal, the reciprocal of-2 is-.
Solution: The reciprocal of 2 is-.
Therefore, choose: B.
Comments mainly examine the definition of reciprocal, which needs to be mastered. It should be noted that
The nature of reciprocal: the reciprocal of a negative number is negative, the reciprocal of a positive number is positive, and 0 has no reciprocal.
Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
16. The reciprocal of ~ 6 is ()
A.-6th century BC
Test center countdown.
Thematic standard questions.
The analysis is solved according to the definition of reciprocity.
Answer: The reciprocal of 6 is,
Therefore, choose: d.
The review of this topic mainly investigates the definition of reciprocal, and the key to solving the problem is the definition of memory.
The reciprocal of 17.5 is ()
b.﹣5·d.﹣
Test center countdown.
Thematic standard questions.
Analysis can be answered directly according to the definition of reciprocal.
Solution: The reciprocal of -5 is-.
Therefore, choose: d.
This question examines the definition of reciprocal, that is, two numbers whose product is 1 are reciprocal.
/kloc-the reciprocal of 0/8. | Yes ()
A.B.﹣2 C.2 D.﹣
Test center countdown.
Analysis is based on the definition of reciprocal: if the product of two numbers is 1, we call these two numbers reciprocal to get the answer.
The peer of is 2.
Therefore, choose: B.
Commenting on this problem mainly focuses on reciprocal, and the key is to grasp that the product of two reciprocal is 1.
/kloc-the reciprocal of 0/9. | Yes ()
B.﹣3 C.﹣ D
Test center countdown.
Analysis is based on the definition of reciprocal: if the product of two numbers is 1, we call these two numbers reciprocal.
Solution: The reciprocal of | is | 3.
So choose B.
Comments on this topic mainly focus on the definition of reciprocal: if the product of two numbers is 1, we call these two numbers reciprocal.
The reciprocal of 20 is ()
b.﹣2·d.﹣
Test center countdown.
According to the reciprocal of two numbers whose product is 1, we can find the reciprocal of a number.
Solution: The reciprocal of is 2,
So choose: a.
This topic reviews the reciprocal, and the exchange position of numerator and denominator is the key to find the reciprocal of a number.
The reciprocal of 2 1. rational number is ()
A.b.﹣·d.﹣
Test center countdown.
Thematic standard questions.
According to the definition of reciprocal, two numbers whose product is 1 are reciprocal to each other, and the answer can be obtained.
Solution:
Therefore, choose: d.
This topic reviews the knowledge of reciprocal, which belongs to the basic topic. The key to solve this problem is to master the definition of reciprocal.
22.(20 14? The reciprocal of Shanwei) -2 is ()
C.﹣ D.﹣0.2
Test center countdown.
According to the reciprocal of two numbers whose product is 1, we can get the answer.
Solution: The reciprocal of 2 is-.
So choose: C.
This question examines the definition of reciprocal, which belongs to the basic question. The key is to master that two numbers whose product is 1 are reciprocal.
23. The reciprocal of ﹣ is ()
A.﹣3 B.3 C.﹣ D
Test center countdown.
According to the meaning of reciprocal, two numbers whose product is 1 are reciprocal. Finding the reciprocal of a number is divided by 1, and 0 has no reciprocal.
Solution: 1? (﹣ )=﹣3.
So choose: a.
This review mainly examines the meaning of reciprocal and the method of finding the reciprocal of a number. Obviously 0 has no reciprocal, and the reciprocal of 1 is itself.
24. The reciprocal of-7 is ()
C.﹣7 D.﹣
Test center countdown.
According to the analysis, two numbers whose product is 1 are reciprocal to each other, and the answer can be obtained.
Solution: The reciprocal of-7 is-,
Therefore, choose: d.
This topic reviews the reciprocal, and the exchange position of numerator and denominator is the key to find the reciprocal of a number.
25.If()？ (-2) = 1, then the real number in brackets should be ().
A.B.2 C.﹣2 D.﹣
Test center countdown.
Thematic standard questions.
According to the meaning of reciprocal, two numbers whose product is 1 are reciprocal. 0 has no reciprocal, and the reciprocal of 1 is still 1.
Solution: ()? (﹣2)= 1,
Therefore, choose: d.
This paper aims to understand the meaning of reciprocal and master the method of finding the reciprocal of a number. It is clear that the reciprocal of 1 is 1, and 0 has no reciprocal.
26. The absolute value of ﹣ is ()
A.﹣3 B.3 C.﹣ D
Test center countdown.
Thematic standard questions.
The analysis and calculation of absolute value should be solved according to the definition of absolute value. Second, according to the definition of absolute value, remove the sign of absolute value.
The absolute value of solution: ﹣ is.
Therefore, choose: d.
The absolute value of a negative number is equal to its reciprocal.
27. The reciprocal of-4 is ()
A.﹣4 B.4 C.﹣ D
Test center countdown.
According to the reciprocal of two numbers whose product is 1, we can find the reciprocal of a number.
Solution: the reciprocal of ﹣4 is ﹣,
So choose: C.
This topic reviews the reciprocal, and the exchange position of numerator and denominator is the key to find the reciprocal of a number.
Fill in the blanks (***3 small questions)
The reciprocal of 28.3 is.
Test center countdown.
According to the definition of reciprocal, we can know.
Solution: The reciprocal of 3 is.
So the answer is:
Comments mainly examine the definition of reciprocal, which needs to be mastered. It should be pointed out that:
The nature of reciprocal: the reciprocal of a negative number is negative, the reciprocal of a positive number is positive, and 0 has no reciprocal.
Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
The reciprocal of 29 is 2.
Test center countdown.
Analysis can be answered directly according to the definition of reciprocal.
Solution: ∵? 2= 1,
? The reciprocal of is 2.
So the answer is: 2.
Commenting on this question examines the definition of reciprocal. Definition of reciprocal: If the product of two numbers is 1, we call these two numbers reciprocal.
The reciprocal of 30 is.
Test center countdown.
According to the reciprocal of two numbers whose product is 1, we can find the reciprocal of a number.
Solution: The reciprocal of is,
So the answer is:
This topic reviews the reciprocal, and the exchange position of numerator and denominator is the key to find the reciprocal of a number.
Relevant articles on rational number multiplication and division in the first volume of seventh grade mathematics published by People's Education Press;
1. Questions and answers on rational number multiplication in the first volume of Grade One.
2. The seventh grade mathematics volume 1 2.7 rational number multiplication training questions
3. People's Education Edition Seventh Grade Mathematics Volume I Final Examination Questions
4. The rational number test in chapter 1 of the first volume of seventh grade mathematics.
5. The seventh grade mathematics volume 1 2.8 rational number division review questions.