Time: 30 minutes. You actually take minutes.
Class name, student number score
First, multiple-choice questions:
1. In the function y= 1 1+x, the range of independent variable calculation is.
2. According to the data of the National Bureau of Statistics, the GDP in the first quarter of 2006 was about 4.33 trillion yuan, which is 10 billion yuan by scientific notation.
3. As shown in the figure, AB‖CD, ∠B=680, ∠E=200,
Then the degree of ∠D is .b.
(Question 3)
4. Class A students participate in tree planting activities, among which B boys (B
5. A set of data 5, -2, 3, x, 3, -2. If every data is a pattern of this set of data, then the average value of this set of data is.
6. It is known that the waist length of an isosceles triangle is 6cm and the bottom length is 8cm, so the circumference of the triangle with the midpoint of each side as the vertex is.
7. Please write an analytical formula of a parabola with an upward opening and a vertical coordinate of-1 intersecting with the Y axis, and passing through the point (1, 3).
8. A school included students' paper and pencil test and practical ability in the total grade of the semester according to the proportion of 60% and 40% respectively. Xiao Ming's practical ability is 865,438+0. If the total score of the semester is not less than 90, the score of the paper-and-pencil I test is at least 0.
9. The picture on the right is a schematic diagram of a proposed gate. The upper part is an arc with a diameter of10m, and the lower part is a rectangular ABCD, where AB = 3.7m and BC = 6m, then the distance from the midpoint of AD to BC is.
10. If the tangent of the acute angle formed by the intersection of the straight line y=k-4 and the Y axis is 12, then the value of k is.
1 1. At △ABC, AB & gtBC & gtAC, D is the midpoint of AC, and the intersection point D is a straight line Z, so the cut triangle is similar to the original triangle, and such a straight line L has three lines.
Second, multiple choice questions
12. The following operation is correct ()
(A)4= 2 (B)2-3=-6 (C)x2？ x3=x6 (D)(-2x)4= 16x4
13. Among the following four patterns, () is both axisymmetric and centrally symmetric.
(A) (B) (C) (D)
14. When △ABC, ∠C=900, BC=2, sinA=23, the length of side AC is ().
(A)5 (B)3 (C)43 (D) 13
15. The two sides of the triangle are 3 and 7 respectively, and the third side is an integer. The minimum perimeter of such a triangle is ().
14(B) 15(C) 16(D) 17
16. As shown in the figure, in △ABC, ∠B=900, AB=6, BC=8. Fold △ABC along DE so that point C falls at C ′ on the side of AB, and C ′ d ‖ BC, then the length of CD is ().
409 (B)509 (C) 154 (D)254
17. There are two boys and two girls, and Miss Wang will arrange seats for them randomly in pairs. The probability of men's and women's volleyball teams together is ().
(A) 14 (B)
18. As shown in the figure, E and F are the points on the side CD and AD of the square ABCD, respectively, CE=DF, AE and BF intersect at point D, and the following conclusion ① AE = BF; ②ae⊥bf； ③AO = OE； (4)sδAOB = s quadrilateral DEOF, and the error is ().
1 (B)2 (C)3 (D)4。
(Question 16) (Question 18) (Question 20)
19. In order to reward students who have made great progress, a class decided to buy three kinds of pens as prizes, the unit price is 4 yuan, 5 yuan and 6 yuan, and 60 yuan is needed to buy these pens; After negotiation, the unit price of each pen dropped by L yuan, and as a result, only 48 yuan was spent, and maybe a pen was bought ().
1 1 (B)9 (C)7 (D)5。
20. As shown in the figure, in rectangles ABCD, EF‖AB, GH‖BC, the intersection point P of EF and GH is on BD, and the quadrilateral with equal area in the figure is ().
(A)3 pairs (B)4 pairs (C)5 pairs (D)6 pairs
Third, the solution: first simplify (1+1x-1) ÷ xx2-1,and then select an appropriate x value for substitution evaluation.