Hunan education edition eighth grade mathematics next term final examination questions.
I. Multiple choice questions (*** 10 small questions, 3 points for each small question, out of 30 points)
1. If the median line of one side of a triangle is equal to half of this side, the triangle is ().
A. isosceles triangle B. right triangle
C. isosceles right triangle
2. If the three sides of a triangle are 6, 8 and x respectively, when the triangle is a right triangle, the value of x is ().
A.8 B. 10 C. 2 D. 10 or 2
3. In the following linear function, y decreases with the increase of x value ().
A.y = 2x+ 1 b . y=3﹣4x c . y = x+2d . y =(﹣2)x
4. Given that the sample size is 30 and the height ratio of each small rectangle in the histogram of sample frequency distribution is 2: 4: 3: 1, the frequency of the second group is ().
A. 14 B. 12 C. 9 D. 8
5. After the point P (﹣ 2, 1) moves down by 2 unit lengths, what is the image point P reflected by the X-axis? The coordinate of is ()
A.(﹣2,﹣ 1)(2,﹣ 1)(﹣2, 1)(2 1)
6. In quadrilateral ABCD, diagonal AC and BD intersect at point O, and the following four conditions are given: (1)AB∑CD, AD=BC. ②AB∨DC, AD ∨ BC. ③AB = DC, AD = BC. (4) OA。
A. 1 b group 2 c group 3d group 4 group
7. In the following figures, the figure with both central symmetry and axial symmetry is ().
A. diamond B. parallelogram C. equilateral triangle D. trapezoid
8. The following statement is incorrect ()
A set of rectangles with equal adjacent sides is a square.
B. A diamond with equal diagonal lines is a square.
C. A rectangle with diagonal lines perpendicular to each other is a square.
A parallelogram with right angles is a square.
9. Given that the circumference of an isosceles triangle is 20cm, the length of its base is ycm, and the length of its waist is xcm, the functional relationship between y and x is ().
A.y=20﹣2x(0