Examination questions for the final exam of eighth grade mathematics
1. Multiple choice question: This big question is ***8 small questions, each with 3 points and * * * 24 points. Only one answer to each small question is correct. Please fill in the correct answer on the answer sheet.
The arithmetic square root of 1.36 is ()
B.﹣6 C？ 6 D。
2. In the plane rectangular coordinate system, is point A(l, 3) symmetrical about the origin O? The coordinate of is ()
A.(﹣ 1,3)b.( 1,﹣3)(3， 1) D.(﹣ 1,﹣3)
3. It is known that the real numbers x and y satisfy, so the perimeter of an isosceles triangle with the values of x and y as two sides is ().
20 or 16
C.16 d. None of the above answers are correct.
4. The mirror image of function y = x-2 fails ().
A. first quadrant B. second quadrant C. third quadrant D. fourth quadrant
5. As shown in the figure, known? ABC=？ DCB, the following conditions cannot prove that △ ABC△ DCB is ().
A.？ A=？ DC C？ ACB=？ DBC DC =BD
6. As shown in the figure, it is known that in △ABC, CD is the high line on the AB side, and BE is equally divided. ABC, crossing CD at point E, BC=5, DE=2, then the area of △BCE is equal to ().
A. 10
7. As shown in the figure, in △ABC, AB=AC,? A=36？ The midline DE of AB passes through AC to D, AB to E, and the following conclusion is wrong ().
A.BD split equally? The circumference of ABC B.△BCD is equal to AB+BC.
C. ad = BD = BC D. point d is the midpoint of line segment AC.
8. Two cars, A and B, travel from city A to city B at a constant speed. During the whole driving process, the functional relationship between the distance y (km) from the car A to the city A and the driving time t (hours) is as shown in the figure. Then draw the following conclusions:
①A and B are 300 kilometers apart;
② The second train leaves later than the first train 1 hour, but arrives earlier 1 hour;
③ Catch up with the A car 2.5 hours after the departure of the B car;
④ When the distance between A and B is 50km, t= or.
The correct conclusion is ()
1。
Fill-in-the-blank question: This big question is a small question of *** 10, with 3 points for each small question and 30 points for * * *. Please fill in the answer sheet.
9. As shown in the figure, AB=AC. In order to make △ Abe △ ACD, the condition to be added is (only one condition is added).
10. If the value of is between two integers a and a+ 1, then a=.
1 1. There are three red balls and two white balls in the pocket except the colors are exactly the same. Pick any ball, and then pick the ball (fill in? Red? Or? White? ) the probability is high.
12. After translating the straight line y = 2x-4 upward by 5 units, the expression of the straight line is.
13. in the plane rectangular coordinate system xOy, if the point P(2, a) is on the image of the proportional function, the point Q(a, 3a-5) is located in the fourth quadrant.
14. It is known that P 1(﹣ 1, y 1) and P2(2, y2) are two points on the image of linear function y=﹣x+3, then y 1 y2 (fill in. & gt？ Or? & lt？ Or? =? ).
15. As shown in the figure, in the plane rectangular coordinate system, the right-angle AOCD is folded along the straight line AE (point E is on the edge DC), and the folded end point D just falls on the point F on the edge OC. If the coordinate of point D is (10,8), the coordinate of point E is.
16. It is known that the fractional equation about x has an increasing root, then a=.
17. As shown in the figure, a straight line y=kx+b passing through point B (﹣ 2,0) and a straight line y=4x+2 intersect at point A (﹣ 1, 2), then the inequality 4x+2.