"Number Axis" Test Questions and Answers in the First Volume of Mathematics in Junior One.
First, multiple-choice questions (***24 small questions)
The reciprocal of 1 -5 is ()
C.﹣5 D
The number of test sites is opposite.
Special calculation problems.
Analysis shows that only two numbers with different symbols are called opposites and cannot exist independently. From the number axis, except 0, the two numbers are opposite, on both sides of the origin, and the distance from the origin is equal.
Answer: The reciprocal of-5 is 5.
So choose a.
The comment on this topic mainly investigates the concept and significance of inverse numbers: only two numbers with different symbols are called inverse numbers, which cannot exist alone. From the number axis, except 0, all numbers are opposite, on both sides of the origin, and the distance from the origin is equal.
2. The reciprocal of-6 is ()
A.﹣6 B.6 C.﹣ D
The number of test sites is opposite.
Analysis can be answered according to the concept of reciprocal.
Solution: The reciprocal of 6 is 6,
Therefore, choose: B.
The commentary on this question examines the significance of reciprocal. Is the reciprocal of a number added before this number? ﹣? Number; The reciprocal of a positive number is negative, the reciprocal of a negative number is positive, and the reciprocal of 0 is 0.
3. The reciprocal of-5 is ()
A.B.﹣5 area 5
The number of test sites is opposite.
The analysis is directly solved according to the definition of inverse number.
Answer: The reciprocal of-5 is 5.
So choose D.
Commenting on this question, we examine the inverse number: the inverse number of A is ﹣ A.
4.-2 is 2 ()
A. reciprocal B. reciprocal C. absolute value D. arithmetic square root
The number of test sites is opposite.
Analysis is based on the concept of reciprocal: only two numbers with different signs are called reciprocal, and the answer can be obtained directly.
Solution: -2 is the reciprocal of 2,
So choose: a.
The comment on this topic mainly examines the reciprocal, and the key is to master the concept of reciprocal.
The reciprocal of 5.-3 is ()
A.-3 B.-Area 3
The number of test sites is opposite.
Thematic standard questions.
The basis of analysis is that only two numbers with different symbols are opposite.
Answer: The reciprocal of-3 is 3.
Therefore, choose: d.
This review examines the definition of the opposite number, which is the basic question, and the concept of memory is the key to solving the problem.
The reciprocal of 6.20 14 is ()
A.b.﹣c.﹣20 14 d 20 14
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
Solution: The reciprocal of 20 14 is -20 14.
So choose: C.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
7. The inverse of | is ()
A.B.﹣ C.7 D.﹣7
The number of test sites is opposite.
Thematic standard questions.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
The opposite solution: Yes,
So choose: a.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
8. The reciprocal of rational number -3 is ()
b.﹣3·d.﹣
The number of test sites is opposite.
Thematic standard questions.
According to the meaning of inverse number, only numbers with different signs are inverse numbers.
Answer: The reciprocal of-3 is 3.
So choose: a.
The commentary on this topic examines the significance of the inverse number. Only numbers with different signs are anti-numbers, and the anti-number of 0 is 0.
9. The inverse of ﹣ is ()
A.b.﹣C5 d.﹣5
The number of test sites is opposite.
Analyze and find the inverse of a number, that is, add a negative sign in front of this number.
Answer: The inverse operation of ﹣ is.
So choose: a.
The commentary on this question examines the significance of reciprocal. Is the reciprocal of a number added before this number? ﹣? Number. The reciprocal of a positive number is negative, the reciprocal of a negative number is positive, and the reciprocal of 0 is 0. It is easy for students to confuse the meaning of reciprocal with that of reciprocal.
The reciprocal of 10.4 is ()
A.4 B.-4 city
The number of test sites is opposite.
Analysis According to the nature of antonyms, the sum of two mutually antonyms is 0, which can be solved by testing one by one.
Solution: According to the concept, (the inverse of 4) +(4)=0, then the inverse of 4 is ﹣4.
Therefore, choose: B.
Comments mainly examine the nature of opposites.
The definition of enantiomer is that only two numbers with different signs are enantiomers, and the enantiomer of 0 is 0.
The reciprocal of 1 1. | Yes ().
A.B.﹣ C.﹣2 D.2
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
The opposite solution: Yes,
So choose: a.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
The reciprocal of 12.205438+04 is ()
2014 B.-2014 city
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
Solution: The reciprocal of 20 14 is -20 14.
Therefore, choose: B.
The commentary on this topic examines the concept of reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
/kloc-the reciprocal of 0/3. Yes ()
C.﹣2 D.﹣
The number of test sites is opposite.
According to the definition of enantiomer, only two numbers with different signs are enantiomers, and the enantiomer of ﹣ is.
Solution: the opposite number of the sign of ﹣ is, so the opposite number of ﹣ is;
Therefore, choose: B.
Comment on the meaning of the main inverse of this question. Only two numbers with different signs are anti-numbers, and the anti-number of a is-a.
14.a(a？ The reciprocal of 0) is ()
A.-a second century BC
The number of test sites is opposite.
The analysis is directly solved according to the definition of inverse number.
Solution: The inverse of A is ﹣ A.
So choose: a.
Comments on this question: The inverse number of A is ﹣a, and correctly grasping the definition of inverse number is the key to solving the problem.
The reciprocal of 15.2 is ()
C.﹣2 D
The number of test sites is opposite.
Thematic standard questions.
Analysis is based on the reciprocal of a number, added in front of this number? ﹣? No, just solve it.
Solution: The reciprocal of 2 is -2.
So choose: C.
The commentary on this question examines the significance of reciprocal. Is the reciprocal of a number added before this number? ﹣? Symbol: the reciprocal of a positive number is negative, the reciprocal of a negative number is positive, and the reciprocal of 0 is 0. Don't confuse the meaning of reciprocal and reciprocal.
16. If the reciprocal of a number is 3, then the number is ().
A.﹣·c.﹣3
The number of test sites is opposite.
Two numbers are opposite, and their sum is 0.
Solution: Let the reciprocal of 3 be x 。
Then x+3=0,
x=﹣3.
So choose: C.
Commenting on this question examines the concept of reciprocal. Two numbers are reciprocal, and their sum is 0.
/kloc-the reciprocal of 0/7. Yes ()
A.﹣·c.﹣5
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
The opposite solution: Yes,
Therefore, choose: B.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
18. The reciprocal of a real number is ().
A.-2 years BC D.-0.5 |
The number of test sites is opposite.
Analysis is based on the concept of reciprocal: only two numbers with different symbols are called reciprocal to get the answer.
The opposite solution: Yes,
Therefore, choose: B.
The comment on this topic mainly examines the reciprocal and correctly grasps the concept of reciprocal.
/kloc-the reciprocal of 0/9. Yes ()
A.B. C.﹣ D.﹣
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
The inverse of the solution: is,
Therefore, choose: d.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
The antonym of 20 is ()
A.B.﹣2 area 2
The number of test sites is opposite.
Special calculation problems.
Analysis can be answered according to the definition of inverse number.
Solution: According to the definition of inverse number, the inverse number of ﹣ is ﹣ (﹣) =.
So choose: C.
Comments on this topic examines the definition of inverse number, that is, only two numbers with different symbols are called inverse numbers.
The reciprocal of 2 1.3 is ()
C.﹣3 D.﹣
The number of test sites is opposite.
Analysis can be answered according to the definition of reciprocal.
Solution: the reciprocal of 3 is -3, so choose C.
This review examines the reciprocal, and the key to solving this problem is to memorize the definition of reciprocal.
22. The reciprocal of-6 is ()
A.6 B.-6 city
The number of test sites is opposite.
Analysis can be answered according to the definition of reciprocal.
Solution: the reciprocal of 6 is 6, so choose: a.
This review examines the reciprocal, and the key to solving this problem is to memorize the definition of reciprocal.
23. The opposite number of is ()
A.b.﹣C3 d.﹣3
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite, and you can choose after solving.
Answer: The inverse operation of ﹣ is.
So choose: a.
This review mainly examines the definition of reciprocal, which is the basic question, and the concept of memory is the key to solving the problem.
24. The opposite number of is ()
A.B.﹣ C.2 D.﹣2
The number of test sites is opposite.
Special calculation problems.
Analysis can be answered according to the concept of reciprocal.
Answer: The reciprocal of is ﹣, just add a minus sign.
Therefore, choose: B.
The commentary on this question examines the significance of reciprocal. Is the reciprocal of a number added before this number? ﹣? Number; The reciprocal of a positive number is negative, the reciprocal of a negative number is positive, and the reciprocal of 0 is 0.
Fill in the blanks (***6 small questions)
The antonym of ﹣ is.
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
The opposite solution: Yes,
So the answer is:
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
26. If the reciprocal of A is -9, then a= 9.
The number of test sites is opposite.
Analysis can be defined according to reciprocal.
Solution: the reciprocal of a is 9,
? a=9。
So the answer is: 9.
The commentary on this question examines the definition of opposites. Numbers with only two different signs are called opposites, one of which is the opposite of the other.
The antonym of ﹣ is.
The number of test sites is opposite.
To find the inverse of a number by analysis is to add it before this number? ﹣? Number.
The inverse of the solution: ﹣ is ﹣ (﹣) =.
So the answer is:
The commentary on this question examines the significance of reciprocal. Is the reciprocal of a number added before this number? ﹣? Number;
The reciprocal of a positive number is negative, the reciprocal of a negative number is positive, and the reciprocal of 0 is 0. It is easy for students to confuse the meaning of reciprocal with that of reciprocal.
The reciprocal of 28. 3 is -3.
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
Solution: The reciprocal of 3 is -3,
So the answer is: -3.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
29. The reciprocal of-20 14 is 2014.
The number of test sites is opposite.
Thematic standard questions.
According to analysis, only two numbers with different symbols are opposite to each other can we get the answer.
Solution: The reciprocal of 20 14 is 20 14.
So the answer is: 20 14.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
The reciprocal of 30.20 14 is -20 14.
The number of test sites is opposite.
According to the analysis, only two numbers with different signs are opposite to each other can we get the opposite number of a number.
Solution: The reciprocal of 20 14 is -20 14.
So the answer is: -20 14.
Comment on this question, and examine the reciprocal. Adding a minus sign in front of a number is the reciprocal of this number.
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