East China Normal University Edition Eighth Grade Volume II Mathematics Final Examination Paper
First, multiple-choice questions (3 points for each small question, 30 points for * * *)
1, the topic that can determine that the quadrilateral ABCD is a parallelogram is ()
a、AB∨CD、AD=BC B、A=？ b，？ C=？ D
c、AB=CD、AD=BC D、AB=AD、BC=CD
2. In a shooting test, the average cycle times of A, B, C and D are the same, but the variances are 8.7, 6.5 and 9. 1 respectively.
7.7, then among these four people, the most stable shooting performance is ().
A，A B，B C，C D，D
3, the following three values in each group of data are three sides of a triangle, respectively, can't form a right triangle is ()
A.3、4、5 B.6、8、 10 c . 2、D.5、 12、 13
4, the following proposition is correct ()
A, the quadrilateral with equal diagonal lines is a rectangle B, and the quadrilateral with diagonal lines bisected vertically is a square.
C, the quadrilateral with perpendicular diagonal lines is a diamond D, and the quadrilateral with perpendicular diagonal lines and equal diagonal lines is a square.
5, linear function and proportional function graphic 1, then the following statement is correct ().
A, their function value y increases with the increase of x, and their function value y decreases with the increase of x.
C, the values of their independent variable x are all real numbers. d、k & lt0
6. As shown in Figure 2, if an equilateral triangle CDE is made outside the square ABCD, then? The degree of DAE is ()
a、20？ b、 15？ c、 12.5？ d、 10？
7, such as 3, in the circumference of 20cm □ABCD, AB? Relative to point o, OE, AD, AC, BD? BD, pay AD to e,
then what Abe's circumference is ()
A, 4cm, b, 6cm c, 8cm d,10cm
8. Given points (-4, y 1) and (2, y2) are on the straight line y= +2, then the relationship between y 1 and y2 is ().
A.y 1 = y2 b . y 1 & gt； y2 C、y 1
9. Which of the following points is not on the image of function y= +3 ()?
a 、( 1，2) B 、( 0，3) C 、( 1，5) D 、( 2，- 1)
10, the following calculation is correct ()
A, B, C, D,
Fill in the blanks (3 points for each small question, 24 points for * * *).
1 1, the coordinate of the intersection of the linear function y= x+3 and the x axis is.
12 as shown in the figure, given that the images of functions y=2x+b and y=ax-3 intersect at point p (-2, -5), the solution set of inequality 2x+b >:ax-3 is
13. If real numbers A and B are satisfied, the value of a+b is
The median of 14, data -3, -2, 1, 3.6, x, 5 is 1, so the mode of this set of data is.
15. As we all know, the lengths of two sides of a triangle are 2 and 6 respectively. To make this triangle a right triangle, the length of the third side is.
16. As shown in the figure, put a chopstick with a length of 24cm on a cylinder with a base diameter of 5cm and a height of 12cm.
Let the length of chopsticks exposed in the V-shaped cup be h cm, and the value range of h is.
17, as shown in the figure, point p is a point on the diagonal BD of the square ABCD, PE? BC, PF in e? CD in f,
Connecting EF, the following four conclusions are given: ① AP = EF; ②? APD must be an isosceles triangle; ③? PFE=
? BAP④PD= EC, where the serial number of the correct conclusion is
18. If it makes sense, the value range of x is _ _ _ _ _ _ _ _.
Third, answer questions.
19, (10 point) is known, and the value is.
20.(8 points) A school should choose one of Xiao Wang and Xiao Li to participate in the whole country.
In the math competition, in the last five selections, their achievements are as follows:
Answer the following questions according to the table on the right:
Mean Median Mode Variance of Name Range
Xiao Wang 40 80 75 75 190
Xiao Li
(1) Complete the above table:
(2) In these five tests, who are the students whose grades are relatively stable? If the score above 80 points (including 80 points) is regarded as excellent, what are the excellent rates of Xiao Wang and Xiao Li in these five tests respectively?
2 1, (8 points) is the plan of a piece of land as shown in the figure, where AD = 4m, CD = 3m, AB = 13m, BC= 12.
Rice? ADC=90？ Find out the area of this land.
4.( 10 point) As shown in the figure, the image of the linear function y=kx+b passes through two points (2,4) and (0,2) and intersects with the X axis at point C.
Find the analytical expression of the linear function: (1). (2)? AOC's area.
5, (10 points) known linear function y=ax+b and proportional function y=kx(k? 0) at point P(2,-1).
(1) Find the relationship between these two functions;
(2) according to the image, write a linear function value domain smaller than the proportional function value;
The second volume of the eighth grade, the final examination paper of mathematics, East China Normal University Edition.
I. CCBCB BDBAC
Second, 1 1, (-6,0)12, X >；; -2 13,-1 14, 1 15, or 4.
16、 1 1? h？ 12 17、①③④ 18、x=0
Three. 19, x=3, y=5, and the original formula = 19.
20、( 1)20, 80, 80, 80, 40
(2) The student with relatively stable grades is Xiao Li;
Xiao Wang has an excellent rate of 40% and Xiao Li has an excellent rate of 80%.
2 1, then communicate, and get S=S? ABC-S？ ADC=24 (m2)
22 、( 1)y=x+2
(2)4
23 、( 1)y=- x y=-x+ 1
(2)x & gt； 2
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