People's education printing plate junior one mathematics volume two final examination questions.
First, multiple choice questions
() 1. In the following figures, which are not necessarily axisymmetric?
A. isosceles triangle B. right triangle C. line segment D. right angle
() 2. Throw a coin with uniform texture 50 times. After the coin landed, it appeared face-up 20 times, so the frequency of face-up was
A.B. C. D。
() 3. An opaque box contains two red balls and 1 white balls, all of which are the same except the color. If any ball is pulled out, the following statement is correct.
A. Touching the red ball is an inevitable event B. Touching the white ball is an impossible event.
C. touching the red ball is equal to touching the white ball. D. it is easier to touch the red ball than the white ball.
() 4, if the value is:
A.6 B.9 C. D
() 5. The incorrect figures in the following calculation are
①②③
④⑤
A.4 B.3 C.2 D. 1
6. As shown in the figure, the point is on the extension line. At the point, it is
None of the above is true.
() 7. In and, additional conditions may not be guaranteed, but the additional conditions are as follows.
A.B. C. D。
() 8. After hanging an object (within the allowable hanging weight range), the spring will extend. According to the measurement, the length of the spring has the following relationship with the weight of the suspended object:
The following statement is incorrect.
A..x and y are variables, x is an independent variable and y is a dependent variable.
B. When the weight is not hung, the length of the spring is 0cm.
C. every time the mass of the object increases by 1 kg, the spring length y increases by 0.5 cm.
D when the mass of the suspended object is 7kg, the length of the spring is 13.5cm.
() 9. The obtuse angle between the bisectors of two acute angles of a right triangle is
A. 100 degree B. 120 degree C. 135 degree D. 140 degree.
() 10, as shown in figure, in, is the last point,,, so in the following statement, ① ② ③.
(4), the number of correct statements are
A.4 B.3 C.2 D. 1
() 1 1, as shown in the figure, is the bisector.
At point e, cross at point.
, so the dragon is
A.4 B.3C.6 D.5
() 12, as shown in the figure, in △ABC, AB=AC,? BAC=54？ ,? The bisector of BAC and perpendicular bisector OD of AB intersect at point O, won't it? C-shaped edge EF
(e on BC, f on AC), and points c and
Point o coincides, then? What is the degree of OEC _ _ _ _ _ _ _? .
105 c . 120d . 108
Second, fill in the blanks. (15)
13, scientists found that the length of a virus is, calculated by scientific notation, and the number is _ _ _ _.
14. If the complementary angle of an angle is 150 degrees, then the complementary angle of this angle is _ _ _ _.
15, if the small ants are shown in the figure.
3? Crawling on 3 square tiles,
The probability of finally stopping in black brick is _ _ _ _ _.
16, rectangular area is, and one side is long, then
The perimeter is equal to _ _ _ _.
17 if the value is _ _ _ _.
Third, solve the problem (6 1 minute)
18, drawing questions (8 points) (keep drawing traces, don't write)
(1) known, with a ruler.
② The known ruler is a point: the distance from the point to both sides is equal, and
19, calculation: (① ② 4 points each, ③6 points, *** 14 points)
①
②
(3) Simplify first, then evaluate, among which
20, as shown in the figure, (7 points), congruence? Really? Please provide a justification for the answer.
2 1, (7 points) has a set of mutually unequal triangles whose side lengths are integers, and each triangle has two sides with side lengths of 5 and 7 respectively.
(1) Please write down the length of the third side of a triangle;
(2) Let there be at most n triangles in the group, and find the value of n;
(3) When the number of triangles in this group is the largest, take any one of them and find the probability that the perimeter of the triangle is even.
22, (8 points) as shown in the figure, Germany? AC，？ AGF=？ ABC，？ 1+? 2= 180? Try to judge the positional relationship between BF and AC, and explain the reasons.
23.(7 points) A fruit merchant sold several kilograms of watermelons in the wholesale market at the price of per kilogram 1.8 yuan. He brought some small change for convenience. He sold some at the market price first, and then sold it at a reduced price. The relationship between the number of kilograms of watermelons sold and the amount of money (including change) in his hand is shown in the figure. Answer the following questions with pictures:
(1) How many changes have farmers brought?
(2) What was the price of his watermelon per kilogram before the price reduction?
(3) Then he sold the remaining watermelons at the price of 0.5 yuan per kilogram. At this time, his money (including spare money) is 450 yuan. How many Jin of watermelons did he wholesale?
(4) How much did the fruit merchant earn?
24.( 10 point) As shown in the figure, it is known that in △ABC, AB=AC= 10 cm, BC=8 cm, and point D is the midpoint of AB.
(1) If point P moves from point B to point C at a speed of 3cm/s on BC line and point Q moves from point C to point A on CA line.
① If the moving speed of point Q is equal to that of point P, whether △BPD and △CQP are the same after 1 s, please explain the reason;
② If the moving speed of point Q is not equal to that of point P, when the moving speed of point Q is what, can △BPD and △CQP be congruent?
(2) If point Q starts from point C at the speed of ②, and point P starts from point B at the same time at the original speed, and both move counterclockwise along the triangle of △ABC, how long will it take for point P and point Q to meet at which side of △ABC for the first time?
Reference answer to the final examination paper of the second volume of mathematics in the first day of the People's Education Press
First, multiple-choice questions (2 points for each small question, ***24 points)
1.B 2。 C 3。 D 4。 C 5。 A six. D 7。 An eight. B 9。 C 10。 A 1 1。 B 12。 C
Two. Fill in the blanks (3 points for each question, *** 15 points)
13. 14.60? 15. 16. 17.27
Third, solve the problem (6 1 minute)
18.( 1) Omit the 4-point map (2) Omit the 4-point map.