People's education printing plate seventh grade first volume mathematics final exam questions one, multiple-choice questions. (There are four answers to the following questions, only one of which is correct, *** 10, with 3 points for each question and 30 points for * * *).
The title is 1 23455 6789 10.
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The absolute value of 1 -6 is ()
B.﹣6 C？ 6 D。
2. The new Eurasian Continental Bridge starts from Lianyungang, China, on the west coast of the Pacific Ocean, and reaches ports such as Rotterdam, the Netherlands, on the east coast of the Atlantic Ocean in the west, crossing the central part of the Eurasian continent, with a total length of about 10900 km, and 10900 is expressed as () by scientific notation.
A.0. 109？ 105 B. 1.09？ 104 C. 1.09？ 103 D. 109？ 102
3. The result of calculating -32 is ()
B.﹣9
4. As shown in figure 1, it is an expanded diagram of a cube, and there is a Chinese character on each face, so what is the relationship between the faces of the cube and? Healthy? The Chinese character on the corresponding surface is ()
A. numbers B. learning C. living D.
In order to know the health status of the elderly in this area, an extracurricular interest group conducted four different sampling surveys. What kind of sampling do you think is reasonable?
A. The health status of 1000 elderly people was investigated.
The health status of 1000 elderly people was investigated in the hospital.
C. The health status of 10 elderly neighbors was investigated.
D. Using the household registration network of the police station to randomly investigate the health status of 10% elderly people in this area.
6. The following statement about merging similar items is correct ()
a . 3x+2 x2 = 5x 3 b.2a2b﹣a2b= 1 c.﹣ab﹣a b = 0 d.﹣y2x+xy2=0
7. As shown in Figure 2, it is known that point O is on straight line AB, and CO? Do it at o'clock, if? 1= 145? And then what? The degree of 3 is ()
.35 caliber? B.45？ C.55？ D.65？
8. The following statement is wrong ()
The coefficient of a is B.0, which is a monomial.
The degree of C. is 1 D.-X is a monomial.
9. The price of a commodity is 132 yuan. If you sell it at a 10% discount, you can still make a profit of 10%, then the purchase price of the commodity is ().
A.88 yuan B.98 yuan C. 108 Yuan D. 1 18 yuan
10. If A, B and C are on the same straight line, the line segment AB=6cm and BC=4cm. If M and N are the midpoint of AB and BC respectively, the distance between M and N is ().
A.5cm B. 1cm C.5 or1cm D. cannot be determined.
Scoring reviewer
Fill in the blanks, (**8 small questions, 4 points for each small question, ***32 points)
1 1. If 2℃ above zero is +2℃, then 5℃ below zero is℃.
12. If 3x2k-3 = 5 is a linear equation, then k=.
13. If 2a2bm and-anb3 are similar terms, then nm=.
14. Given that a2+|b+ 1|=0, the value of (a+b)20 15 is.
15. If there are n different points on a straight line, then there are line segments on this straight line.
16. As shown in the figure, the known point O is on the straight line AB. 1=65? 15? ,? 2=78? 30? And then what? 1+? 2= ,? 3= .
17. Xiaoming and Xiaogang specified a new operation △: a△ b = 3a ~ 2b. Xiaoming has worked out 2 △ 5 = ~ 4, please help Xiaogang to work out 2 △ (~ 5) =.
18. If a and b are opposite numbers and both are not zero, the value of (a+b- 1) (+ 1) is.
Iii. Answering questions (***38 points)
19. (5 points for each small question, *** 10) Calculate (1) (-6) 2? [﹣ +(﹣ )]
(2)0﹣23? (﹣ 4)3﹣
20. (5 points for each small question, *** 10) Solve the equation.
( 1)4x﹣3=﹣4(2)( 1﹣2x)=(3x+ 1))
2 1.(8 points) Simplification: 3b+5a [(2a-4b)-(3b+5a)]
22.( 10) In order to understand the physical education examination of ninth-grade students, a school takes the physical education examination scores of ninth-grade students (1) as samples, and makes statistics according to four grades: A, B, C and D, and draws the statistical results into the following statistical chart. Please answer the following questions according to the information given in the chart:
(Description: Grade A: 90 ~100; Grade B: 75 to 89 points; Grade C: 60 to 74 points; Grade D: below 60 points)
(1) Please complete the bar chart;
(2) What is the degree of the central angle of the sector where Grade D is located in the sector statistical chart?
(3) If there are 600 students in the ninth grade of our school, please use the sample to estimate the number of students in the A-level physical education examination.
Volume b
23.(8 points) Simplify before evaluating: 2 (A2B+AB2)-2 (A2B-1)-AB2-2.
Where a= 1 and b =-3.
24.(8 points) Solve equation:.
25.( 10 point) As shown in the figure, it is known that point M is the midpoint of line segment AB, point N is on line segment MB, and MN= AM. If MN=3cm, find the length of line segment AB and line segment NB.
26.( 12 points) As shown in the figure, the straight line AB and CD intersect at point O, and OA is equally divided. EOC。
(1) What if? EOC=70？ , beg? Degree of biochemical oxygen demand;
(2) What if? EOC:？ Eod = 2: 3, Q? The degree of BOD.
27.( 12) The social practice group of grade 7 of a school went to the shopping mall to investigate the sales of goods, and learned that the shopping mall bought 500 shirts of a certain brand at the price of 80 yuan, and sold 400 shirts at the price of 120 yuan. The shopping center will take promotional measures to sell the remaining shirts at a reduced price. Please help the mall figure out how much each shirt will cost.
People's Education Edition, the seventh grade, the first volume of the final examination paper of mathematics, reference answer 1 multiple choice question: (30 points)
The title is 1 23455 6789 10.
Answer a b b b d c c c c c.
Two. Fill in the blanks: (32 points)
1 1.-5; 12.2; 13.8; 14.- 1; 15.n(n﹣ 1)；
16.？ 1+? 2= 143? 45? ,? 3= 36? 15? . ; 17. 16; 18.0.
Third, 1 9. Solution: (1) Original formula =36? (-) 3 points
=- 15- 16 4 points
=﹣3 1; 5 points
(2) Original formula = 0-8? (-64)-3 points
=-4 points
=0.5 points
20. Solution: (1) 4x-3 =-4,
4x-60+3x =-4, 2 points.
7x = 56,3 o'clock
x = 8； 5 points
(2 ) ( 1﹣2x)= (3x+ 1)、
7 (1-2x) = 6 (3x+ 1), 1 point.
7- 14x = 18x+6, 2 points.
-14x- 18x = 6-7, 3 points
-32x =- 1.4 points
X= 5 points
2 1. Solution: (1) Original formula = 3b+5a (-2a+4b-3b-5a) 2 points.
= 3b+5a+7a-b 4 points
= 12a+2b 5 points
22. Solution: (1) The total number of people is: 10? 20%=50,
Then the number of class D is: 50- 10-23- 12 = 5.
The bar chart is supplemented as follows:
; 3 points
(2) The percentage of students in Class D is:1-46%-20%-24% =10%;
What is the central angle of the sector where the D level is located? 10%=36? ; 6 points
(3) The proportion of first-class products is 20%,
Number of people in Grade A: 600? 20%= 120 (person). 10 point
Volume b
23. The original formula = 2a2b+2ab2-2a2b+2-ab2-23 points.
=ab2, 6 points
When a= 1 and b =-3, the original formula =9.8 points.
24. The denominator of the equation is: 4 (2x-1) = 3 (x+2)-12,? 2 points
Without brackets: 8x﹣4=3x+6﹣ 12,? 4 points
Transfer and merger: 5x =-2,? 6 points
Solution: x =-0.4. 8 points
25. solution: MN = AM and MN=3cm.
AM=5cm。 ? 2 points
Point m is the midpoint of line segment AB.
AM=BM= AB，？ 4 points
AB= 10cm。 ? 6 points
∫nb = BM?m n，？ 8 points
NB=2cm。 ? 10 point
26. Solution: (1)∵OA equally divided? EOC，
AOC=？ EOC=？ 70? =35? ,? 2 points
BOD=？ AOC=35？ ; ? 3 points
(2) setting? EOC=2x，？ EOD=3x，？ 4 points
2x+3x= 180 According to the meaning of the question? ，x=36？ ,? 6 points
EOC=2x=72？ ,? 8 points
AOC=？ EOC=？ 72? =36? ,? 10 point
BOD=？ AOC=36？ . ? 12 point
27. Solution: Suppose each shirt is minus X yuan, which depends on the meaning of the problem.
120? 400+( 120﹣x)？ 100=80? 500? ( 1+45%),? 10 point
X=20。 1 1 min
A: When the price of each shirt was reduced by 20 yuan, the expected profit was 45% after the shirts were sold. 12 point