1. Among the following numbers: -(-2),-(-2 2), which is the reciprocal of the absolute value of-2, (-2) 2, where the number of negative numbers is ().
1。
2. Among the following propositions, the correct one is ()
(1) The opposite number is only equal to its own number 0; ② The number whose reciprocal equals itself is only1;
③ The number whose square equals itself is 1 and 0; (4) The numbers whose absolute values are equal to their own are only 0 and1;
A. only 3b. ① and 2c. Only1d. ③④。
On June 24th, 2007, the Long March 3A carrier rocket carrying China's first lunar exploration satellite Chang 'e-1 was successfully launched from xichang satellite launch center Tower III. Technicians designed Chang 'e-1 to adapt to the lunar environment. This is because the temperature difference between day and night on the surface of the moon can reach 3 10℃, and the place where the sun shines vertically during the day can reach 65438.
a . 437℃b . 183℃c .-437℃d .- 183℃
4. It is estimated that the daily economic loss caused by land desertification in China is about 65.438+0.5 billion yuan, and the total economic loss caused by land desertification in China in one year (calculated by 365 days) is expressed by scientific notation ().
a.5.475* 10^ 1 1·5.475* 10^ 10
C.0.547* 10^ 1 1·5.475* 10^8
5. Add two numbers, and the sum is less than one addend and greater than the other, then ()
A. The signs of these two addends are both positive.
C. the signs of these two addends cannot be the same. The signs of these two addends cannot be determined.
7. In the algebraic expressions 5abc, -7x 2+ 1, -2x/5, 1/3, (2x-3)/5, the monomial * * * has ().
1。
8. Xiaogang did a math problem: "Given that two polynomials are A and B, find the value of A+B." He mistook "A+B" for "A-B" and the answer was X-Y. If B=3x-2y is known, then the original value of A+B should be ().
A.4x+3y B.2x-y C.-2x+y D.7x-5y
9. In the following equation, the solution is-1/2 is ().
a . x-2 = 2-x b . 2.5x = 1.5-0.5x c . x/2- 1/4 =-5/4d . x- 1 = 3x
1 1. The distance between Party A and Party B is m kilometers. The original planned train speed was x kilometers per hour. If you travel at a speed of 50 kilometers per hour, the time required for the train to travel from A to B will be reduced by () hours.
A.m/50 b . m/x . c . m/x-m/50d . m/50-m/x
12. Our usual numbers are decimal numbers, such as 2639 = 2 * 103+6 */kloc-0+3 *10+9, which means that decimal numbers need10 digits (also called numbers) There are only two numbers: 0 and 1. For example, the binary number 10 1 =1* 21+1= 5, then the binary number101is equal to decimal.
56 C.57 D.58
Fill in the blanks (2 points for each small question, *** 16 points)
13. Integer greater than -2 and less than 1 is _ _ _ _ _ _ _ _.
14. If the square of a number is 9, then the cube of this number is _ _ _ _ _.
15. Calculation:10+(-2) * (-5) 2 = _ _ _ _ _.
The divisor16.24,700 is accurate to _ _ _ _ _ _ _ _ _, with _ _ _ _ _ _ significant digits.
17. If the algebraic expressions 2x-6 and -0.5 are reciprocal, then x = _ _ _ _ _
18. If the sum of 2 * A 3N and -3 * A 9 is still a monomial, then A = _ _ _ _ _ _
Four, column equation to solve application problems (*** 13 points)
29. (4 points in this question) Party A and Party B each process a batch of parts with the same number in the workshop. Party A can process 25 parts per hour, and Party B can process 20 parts per hour. Because Party A went to the meeting first, he worked less than Party B 1 hour. As a result, both of them completed the task at the same time, and each person was required to process the total number of parts.
30. (Question 4) The opening of the Qinghai-Tibet Railway is the wish of several generations of China people. On this railway line, there is a long frozen soil between Golmud and Lhasa. The speed of the train is 100 km in frozen soil section and 120 km in non-frozen soil section. From Golmud to Lhasa, it takes about O.77 hours for the train to pass through the frozen section than the unfrozen section.
(1) How many kilometers is the unfrozen area longer than the frozen area expressed by the algebraic expression with t?
(2) If the total length of Golmud-Lhasa railway is118km, find t (accurate to O.O.1) and the length of frozen soil section (accurate to one place).
3 1. (5 points in this question) A grade used the summer vacation to organize students to travel abroad, 10 Parents' representatives traveled with the group. A travel agency said, "If all parents of 10 buy full tickets, the rest of the students can enjoy a half-price discount"; Travel agency B said, "Including 10 parent representatives, all air tickets are offered a 40% discount on the total ticket price". If the total fare is 40 yuan,
(1) If the number of students is 30, how much does the travel agency charge? If the number of students is 70, how much does the travel agency charge?
(2) When the number of students is what, are the charges of the two travel agencies the same?
(3) Which travel agency is more economical to choose?
V. Asking questions (***3 points)
32. Let A, B and C be rational numbers, and in the multiplication operation of rational numbers, satisfy;
(1) switching rule a * b = b * a(2) distribution rule of addition (A+B) * C = A * C+B * C.
Now let's have a&; B This operation is defined as follows: a &；; b=a*b+a+b
Discussion: Does this operation satisfy the (1) commutative law? (2) The distribution law of addition? Explain by calculation.
Six, additional questions (***6 points, recorded in the total score, but the total score does not exceed 100 points. )
33. (3 points for this question) Proof: 1/3
34. (3 points for this question)
There are three integer solutions to the equation about x ||| x-2 |-1| = a, so find the value of a.
Seventh grade "People's Education Edition" Volume I Mathematics Final Exam: Baidu. /s？ KW =% D6% DC% BD% DC% C2% D7 & sc = web & ampcl = 3 & ampTN = site Hao 123 & amp； ct = 0 & amppn = & amprn = & amplm = & ampie = GB 23 12 & amp； rs2 = & ampmyselectvalue = & ampf = & amppv = & ampz = & ampfrom = & ampword = % C6 % DF % C4 % EA % BC % B6 % C9 % CF % B2 % e 1 % CA % FD % d 1% A7 % C6 % DA % C4 % A9 % BF % BC % BE % ED
There are many ``.
Watch and download it yourself.
In the seventh grade, the first volume of mathematics final exam, maybe because I only learned the unary equation, I didn't take it. Even if the exam is just a basic question, it won't be the finale.
Yangpu District, Shanghai, in 2009, the seventh grade, Volume I, the final exam of mathematics. Multiple choice problem
1. Let a set satisfy the mapping from m to p, then the number of different mappings is ().
A.7 B. 6 C. 4 D. 2
2. The following judgment is correct ()
A.this is a uniform function.
B.this is a strange function.
C it is both an odd function and an even function.
D. nonsingular even function
3. Functions and images of functions ()
A. About linear symmetry B. About linear symmetry
C. About linear symmetry D. About linear symmetry
4. The area of closed graph surrounded by function image and axis is ()
A. 65438 BC+0 BC.
5. It is "the function always exists" ()
A. Sufficient and unnecessary conditions B. Necessary and insufficient conditions
C. Necessary and sufficient conditions D. Unnecessary and insufficient conditions
6. It is the increasing function on the interval ().
A.B.
C.D.
7. Give the following four function equations and four function images:
( 1)
(2)
(3)
(4)
The group with correct correspondence between them is ()
A.A-(3)，B-( 1)，C-(2)，D-(4)
B.A-( 1)，B-(2)，C-(3)，D-(4)
C.A-(2)，B-(4)，C-( 1)，D-(3)
D.A-(2)，B-(3)，C-(4)，D-( 1)
8. It is known that it is an even function. If it is a negative function, if it is remembered, then there is ().
A.B. C. D。
9. When the goods with a unit price of 40 yuan are sold in 50 yuan, 500 pieces can be sold; If the price of this commodity increases by 1 yuan, the sales volume will decrease by 10. In order to get the maximum profit, each sales price should be set at ().
A.45 yuan, 50 yuan, 60 yuan and 70 yuan
10. If there is a point on the terminal edge of the angle, the angle is equal to (below) ().
A.B. C. D。
1 1. If the image of a function is as shown in figure 1, then the expression of this function is ().
A.B.
C.D.
12. To get the image of the function, just put the image of the function ().
A.b. translation unit to the left
C. translate the unit to the right. Translate the unit to the left.
13. Among the following propositions, the correct one is ().
A. If, then
B. The minimum positive period of a function is
C in the middle, if, then it is an isosceles right triangle.
D, changing the horizontal coordinates of each point on the function image to the original multiple, and then translating to the left to obtain the image of the function.
14. The minimum positive period of the function is 2, and the image is symmetrical about a straight line, so a value of can be ().
A.B. C. D。
15. Let the maximum value of the function be and the minimum value be, then the value of is ().
A. 0 BC.
Step 2 fill in the blanks
16. It is known that the range of real numbers is _ _ _ _ _ _ _.
17. If it is an odd function, then _ _ _ _ _ _ _ _
18. If the domain of the function is r and the conditions are met, then _ _ _ _ _ _ _.
19. In the right-angled trapezoidal ABCD shown in Figure 2, the bottom AB = 6, the top CD = 4, and the height AD = 2, then the maximum area of its inscribed rectangle AEFG is _ _ _ _ _ _ _ _.
20. In, the following proposition is given:
(1) is an acute triangle.
(2)
(3)
(4)
The serial number of the correct proposition is _ _ _ _ _ _.
Three. Answer the question:
2 1. If appropriate, set a meaningful and realistic value range.
22. The value of.
23. As we all know.
(1);
(2) judging the parity and monotonicity of the function;
(3) If it is true, there is a realistic numerical range.
24. Settings.
Domain and value of (1);
(2) The inverse function of;
(3) When the real number takes any value, the equation has different real roots in the interval, so find the sum of the two roots at this time.
25. Set a function, and the image of the function and the image of the function are symmetrical about a straight line.
(1) Find the analytical expression of the function;
(2) Let sum be any two values in the domain and prove it.
;
(3) Let A and B be arbitrarily different points on the image, and prove that straight line AB must intersect with straight line.
26. Set the maximum value to 3 and find the value.
27. In the middle, remember the conditions, conditions. Judge whether a condition is sufficient or necessary, and prove your conclusion.
28. It is known that the quadratic function (which is constant and) satisfies the condition: and the equation has equiroots.
Analytical formula of (1);
(2) Is there a domain of definition and value made by real numbers? If it exists, it is the calculated value; If it does not exist, explain why.
Reference answer
I. ABCDB DDADD CADAA
Ii.16.17.018.6438+0
19.8 20.( 1)(2)(3)
Three. 2 1. What should it be? It is true to know the truth. The function on the right is an addition function, when, the maximum value is obtained, so the value range of is.
22. Original shape
Find the square of the known formula and get.
Re-recognize
Besides,
Then,
So the original formula
23.( 1) set, get, into the theme set, thus obtaining
.
(2) It is calculated, so it is odd function.
When, it is a increasing function, so it is a increasing function, when, it is a subtraction function, so it is a increasing function.
To sum up, when, always add functions.
(3) From the topic, it is a odd function, an additional function, and it has.
find
24. The (1) domain is and the range is.
(2)
(3) The equation is
Set, by, yes, that is, there are two different real roots, remember, and then
solve
So, once again,
Therefore.
25.( 1) Knowing each other is an inverse function, which can be obtained.
(2) Set, and then
(3) Let sum be two different points on the image, as can be seen from (2).
Visible, and the slope of the straight line is 1, so the straight line AB must intersect with the straight line.
26.。
(1) If,
So when, there is a maximum.
Starting from the maximum value
seek
(2) If, then when, there is a maximum.
Starting from the maximum value
seek
All in all,
27. According to conditions
If, then
It can always be pushed, that is.
On the other hand, if it is established, that is, it exists, it can be deduced. As long as it is proved, it can be proved first.
(*)
Just the certificate
The seventh grade first volume mathematics final examination questions 2008-2009 school year first semester seventh grade final mathematics examination paper.
(Exam time 100 minute, full mark on the paper 100 minute)
Class _ _ _ _ _ _ _ Student ID _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
First, multiple-choice questions (3 points for each question, ***36 points)
1. Among the following numbers: -(-2),-(-2 2), which is the reciprocal of the absolute value of-2, (-2) 2, where the number of negative numbers is ().
1。
2. Among the following propositions, the correct one is ()
(1) The opposite number is only equal to its own number 0; ② The number whose reciprocal equals itself is only1;
③ The number whose square equals itself is 1 and 0; (4) The numbers whose absolute values are equal to their own are only 0 and1;
A. only 3b. ① and 2c. Only1d. ③④。
On June 24th, 2007, the Long March 3A carrier rocket carrying China's first lunar exploration satellite Chang 'e-1 was successfully launched from xichang satellite launch center Tower III. Technicians designed Chang 'e-1 to adapt to the lunar environment. This is because the temperature difference between day and night on the surface of the moon can reach 3 10℃, and the place where the sun shines vertically during the day can reach 65438.
a . 437℃b . 183℃c .-437℃d .- 183℃
4. It is estimated that the daily economic loss caused by land desertification in China is about 65.438+0.5 billion yuan, and the total economic loss caused by land desertification in China in one year (calculated by 365 days) is expressed by scientific notation ().
a.5.475* 10^ 1 1·5.475* 10^ 10
C.0.547* 10^ 1 1·5.475* 10^8
5. Add two numbers, and the sum is less than one addend and greater than the other, then ()
A. The signs of these two addends are both positive.
C. the signs of these two addends cannot be the same. The signs of these two addends cannot be determined.
7. In the algebraic expressions 5abc, -7x 2+ 1, -2x/5, 1/3, (2x-3)/5, the monomial * * * has ().
1。
8. Xiaogang did a math problem: "Given that two polynomials are A and B, find the value of A+B." He mistook "A+B" for "A-B" and the answer was X-Y. If B=3x-2y is known, then the original value of A+B should be ().
A.4x+3y B.2x-y C.-2x+y D.7x-5y
9. In the following equation, the solution is-1/2 is ().
a . x-2 = 2-x b . 2.5x = 1.5-0.5x c . x/2- 1/4 =-5/4d . x- 1 = 3x
1 1. The distance between Party A and Party B is m kilometers. The original planned train speed was x kilometers per hour. If you travel at a speed of 50 kilometers per hour, the time required for the train to travel from A to B will be reduced by () hours.
A.m/50 b . m/x . c . m/x-m/50d . m/50-m/x
12. Our usual numbers are decimal numbers, such as 2639 = 2 * 103+6 */kloc-0+3 *10+9, which means that decimal numbers need10 digits (also called numbers) There are only two numbers: 0 and 1. For example, the binary number 10 1 =1* 21+1= 5, then the binary number101is equal to decimal.
56 C.57 D.58
Fill in the blanks (2 points for each small question, *** 16 points)
13. Integer greater than -2 and less than 1 is _ _ _ _ _ _ _ _.
14. If the square of a number is 9, then the cube of this number is _ _ _ _ _.
15. Calculation:10+(-2) * (-5) 2 = _ _ _ _ _.
The divisor16.24,700 is accurate to _ _ _ _ _ _ _ _ _, with _ _ _ _ _ _ significant digits.
17. If the algebraic expressions 2x-6 and -0.5 are reciprocal, then x = _ _ _ _ _
18. If the sum of 2 * A 3N and -3 * A 9 is still a monomial, then A = _ _ _ _ _ _
Four, column equation to solve application problems (*** 13 points)
29. (4 points in this question) Party A and Party B each process a batch of parts with the same number in the workshop. Party A can process 25 parts per hour, and Party B can process 20 parts per hour. Because Party A went to the meeting first, he worked less than Party B 1 hour. As a result, both of them completed the task at the same time, and each person was required to process the total number of parts.
30. (Question 4) The opening of the Qinghai-Tibet Railway is the wish of several generations of China people. On this railway line, there is a long frozen soil between Golmud and Lhasa. The speed of the train is 100 km in frozen soil section and 120 km in non-frozen soil section. From Golmud to Lhasa, it takes about O.77 hours for the train to pass through the frozen section than the unfrozen section.
(1) How many kilometers is the unfrozen area longer than the frozen area expressed by the algebraic expression with t?
(2) If the total length of Golmud-Lhasa railway is118km, find t (accurate to O.O.1) and the length of frozen soil section (accurate to one place).
3 1. (5 points in this question) A grade used the summer vacation to organize students to travel abroad, 10 Parents' representatives traveled with the group. A travel agency said, "If all parents of 10 buy full tickets, the rest of the students can enjoy a half-price discount"; Travel agency B said, "Including 10 parent representatives, all air tickets are offered a 40% discount on the total ticket price". If the total fare is 40 yuan,
(1) If the number of students is 30, how much does the travel agency charge? If the number of students is 70, how much does the travel agency charge?
(2) When the number of students is what, are the charges of the two travel agencies the same?
(3) Which travel agency is more economical to choose?
V. Asking questions (***3 points)
32. Let A, B and C be rational numbers, and in the multiplication operation of rational numbers, satisfy;
(1) switching rule a * b = b * a(2) distribution rule of addition (A+B) * C = A * C+B * C.
Now let's have a&; B This operation is defined as follows: a &；; b=a*b+a+b
Discussion: Does this operation satisfy the (1) commutative law? (2) The distribution law of addition? Explain by calculation.
Six, additional questions (***6 points, recorded in the total score, but the total score does not exceed 100 points. )
33. (3 points for this question) Proof: 1/3
34. (3 points for this question)
There are three integer solutions to the equation about x ||| x-2 |-1| = a, so find the value of a.
Note: Because most of the numbers and letters in the original volume are in the formula editor, they cannot be displayed. I revised some topics, and some topics were really difficult to type, so I deleted them. Please forgive me.
Jiangbei district, 20 12~20 13, seventh grade, the first volume of the math final exam, no, I still want it! ~ ~ ~ ~(& gt； _ & lt)~~~~ !
20 1 1 the analysis of the final examination paper of mathematics in the first volume of grade seven (from Qingdao) is divided into three parts. The first part is that I can't answer and have no clue. Learn how to read, observe and use from the basics. The second part is right, but the middle part is wrong. It will involve the standardization of steps, so you should master the basic knowledge such as changing numbers and removing brackets. The third part is basically wrong, and that can only be a reminder.
The seventh grade first volume mathematics final examination paper: Baidu. /s？ KW =% D6% DC% BD% DC% C2% D7 & sc = web & ampcl = 3 & ampTN = site Hao 123 & amp； ct = 0 & amppn = & amprn = & amplm = & ampie = GB 23 12 & amp； rs2 = & ampmyselectvalue = & ampf = & amppv = & ampz = & ampfrom = & ampword = % C6 % DF % C4 % EA % BC % B6 % C9 % CF % B2 % e 1 % CA % FD % d 1% A7 % C6 % DA % C4 % A9 % BF % BC % BE % ED
There are many ``.
See for yourself.
Is it difficult to take the math final exam in the seventh grade this year? Generally speaking, the paper at the end of the first semester is not difficult, and the second semester is more comprehensive and slightly difficult!
20 13, the final examination paper of the first volume of the second grade mathematics, hello, I see that your question will be squeezed out of the question list by the newly asked questions. If the question is not answered, points will be deducted and reward points will be confiscated! So I'll give you some advice:
First, you can choose the correct classified questions or go to the professional website forums related to your questions, so that more people will know the answers to your questions and more people will answer them.
Second, you can meet more knowledgeable netizens and keep in touch with those who have answered your questions. When you encounter problems, you can ask these friends directly, and they will be more sincere and enthusiastic to find answers for you.
Third, you must do what you should do, and some things must be solved by your own intelligence. It is impossible for others to do it for you! Only by doing it yourself can you truly belong to yourself. Others can only give you guidance and advice, and ultimately you have to rely on yourself.
You may not accept my answer, but please accept my suggestion!
Although my answer may not solve your problem, it will definitely make you use it better ~ ~