20 17 people's education printing plate seventh grade mathematics volume second term examination paper topic
First, multiple-choice questions (2 points for each small question, 20 points for * * *)
The arithmetic square root of 1 and 16 is ()
A, B, C, D,
2, real number, 0.3,,, and the number of irrational numbers is ()
a、2 B、3 C、4 D、5
3. If the seating chart? Five columns and two rows? Note (5,2), then (4,3) means ()
A, 3 columns 5 rows b, 5 columns 3 rows c, 4 columns 3 rows d, 3 columns 4 rows
4. If the point P(3, y) is in the fourth quadrant, the value range of y is ().
a、y & gt0 B、y & lt0 C、y？ 0 D、y？ 0
5. In order to know the health status of more than 60,000 people in a city 1000, we randomly selected1000 people for investigation. In this question, the health status of 1000 people is ().
A, population b, individual c, sample d and sample size
6. If a>b, then the following inequality must be correct ().
a 、& lt 1 B 、>; 1 c, >; d 、& gt0
7. If it is the solution of the equation ax-y=3 about X and Y, then the value of A is ().
a、 1 B、2 C、3 D、4
8. As shown in figure 1, if the real number A is on the left of the origin of the number axis, then the size relationship between the real numbers A, -a and 1 is correct ().
a、a & lt 1 & lt； -a B、a & lt-a & lt； 1
c、 1 & lt； [Ancient names or Latin modern names of animals and plants]
9, the following proposition, is not correct ()
A, adjacent complementary angles are complementary; B, the internal dislocation angle is equal; C, the vertex angles are equal; D, the vertical segment is the shortest.
10, among the following surveys, () is suitable for a comprehensive survey.
A, investigate people's environmental awareness B, investigate the quality of zongzi in the Dragon Boat Festival market.
C, investigate the weight of 50 students in a class d, and investigate the safety and quality of a certain type of fireworks explosion.
Fill in the blanks (3 points for each small question, *** 15 points)
1 1, if known, then x =；;
12, when x, the value of formula 3+x is greater than the value of formula;
13 as shown in fig. 2, the straight line l intersects the straight lines AB and CD at e, f,
? 1= 105? What time? When 2= degrees, ab ∨ CD; Figure 2
14, and the solution of the equations is:
15. after investigation, what kind of transportation do students use to go to school? Bicycle? 、? Bus? 、? Other? The ratio is 7:3:2. If there are 3000 students in this school, choose? Bus? The number of students is;
Iii. Answering questions (5 points for each small question, 25 points for * * *)
16, calculation: 17, solving inequality group:
18, as shown in Figure 3. The straight line AB and CD intersect at O, and OE is? Angular bisector of AOD? AOC=28？ , beg? AOE degree
Figure 3
19, solving the equation:
20. As shown in Figure 4, move △ABC to the right by 5 unit lengths.
Then translate it down by 2 unit lengths to get δ. Please draw it.
Draw the translated figure and write the coordinates of each vertex.
4. Answer questions (8 points for each small question, 40 points for * * *)
2 1. A stationery store has three kinds of stationery boxes with unit price: 10 yuan, 15 yuan and 20 yuan. The mall made statistics on the sales volume of these three kinds of pencil cases in March 20 14, and drew a statistical chart (incomplete) as follows:
(1) How many pencil boxes did a * * draw in this survey?
(2) Find the expression shown in Figure 5? 15 yuan? The degree of the central angle occupied by the sector;
(3) Complete the bar chart in Figure 6.
22. At present, there are 35 RMB * * and 50 yuan RMB with a denomination of 100 yuan, with a total denomination of 3,000 yuan. How much RMB are there respectively?
23, as shown in figure 7, known? ABC= 180？ -? a、BD？ D CD, EF? CD is in F.
(1) verification: ad ∨ BC;
(2) What if? 1=36? , beg? The degree of 2.
Figure 7
24. In the plane rectangular coordinate system, point A (1, 2a+3) is in the first quadrant.
(1) If the distance from point A to the X axis is equal to the distance to the Y axis, find the value of a;
(2) If the distance from point A to the X axis is less than the distance to the Y axis, find the value range of A. ..
25. In order to expand production, a formula decided to buy six machines, but the funds used should not exceed 680,000 yuan. There are two kinds of machines to choose from, A machine is 654.38+0.4 million yuan, and B machine is 654.38+0.0 million yuan. What are the procurement plans according to the company's requirements and explain the reasons?
20 17 people's education printing plate seventh grade mathematics volume second final examination paper reference answer
1- 10
1 1、?
12 、& lt﹣8
13、75
14、
15、750
16、
17、x & gt 1
18, solution: ∵? AOD+？ AOC= 180？ ,
Know again? AOC=28？ ,
AOD= 152？ ,
∵OE is? The bisector of AOD,
AOE=76？ .
So the answer is: 76? .
19、
20. Solution: As shown in the figure:
As can be seen from the figure, a? (4，0)，B？ ( 1，3)，C？ (2,﹣2).
2 1, solution: (1)90? 15%=600 (pieces);
(2)360? ( 1﹣ 15%﹣25%)=2 16? ;
(3) The unit price1the number of stationery boxes sold in 0 yuan is: 600? 25%= 150 (piece),
The statistical chart is as follows:
22. Solution: We assume that X pieces of RMB with a face value of 100 yuan and Y pieces of RMB with a face value of 50 yuan are deduced from the meaning in the question.
solve
A: There are 25 RMB with a denomination of 100 yuan and 10 RMB with a denomination of 50 yuan.
23.( 1) Proof: ∵? ABC= 180？ ﹣? One,
ABC+？ A= 180？ ,
? ∨ BC;
(2) solution: ∫AD∨BC,? 1=36? ,
3=? 1=36? ,
∵BD？ CD，EF？ CD，
? BD∑EF，
2=? 3=36? .
24. Solution: (1) ∫ The distance from point A to the X axis is equal to the distance to the Y axis.
? 2a+3= 1，
The solution is a =-1;
(2) The distance from point A to the X axis is less than the distance to the Y axis,
? 2a+3 & lt； 1,
Get an a
25. solution: if there are x machines of model a, then the machine of model b is (6-x).
14x+ 10(6﹣x)？ 68,
Solution: x? 2,
∵x？ 0, and x is an integer,
? X=0 or x= 1 or x=2,
? Company * * * has the following three procurement schemes:
Scheme 1: 0 A-type machines and 6 B-type machines;
Option 2: If there are 1 Class A machines, then buy 5 Class B machines;