1. Can you fill it out quickly and accurately? (20×2 points = 40 points)
1. If 5m moving eastward is marked as +5m, 3m moving westward should be marked as m. ..
2. The number that is neither positive nor negative is.
3. The inverse of-(-3) is; The reciprocal of 1 is.
4. If a < 0, |a|=.
5. The coefficient of single item-is, and the number is.
6. If | A+3 |+(b-2) 2 = 0, then A-B =.
7. as shown in figure 1: ab.
The complementary angle of 8.69 30' is equal to.
9.0.02079 Keep three significant figures.
10. The sum of monomial -x2my and x6yn is monomial, then m =, n =.
1 1. Polynomials a4+4a3b-6ab2+4ab3 are arranged in descending order of B as follows.
12. Nail a piece of wood to the wall, at least, according to.
13. Write 15800000 according to scientific notation.
14. As shown in Figure 2: ∠ 1 = ∠ 2, then ∠, ∠ bad+= 180.
Second, you can definitely choose the right one! (3 points ×8 = 24 points)
15. Regarding rational numbers, the following statement is true ().
(a) the largest number; (b) has the smallest absolute quantity.
(c) The minimum number; (d) Has the largest absolute quantity.
16. It is known that A, B and C are rational numbers, so the inverse of a+b+c is ().
(A)b+ A-C(B)-B- A-C(C)-B- A+C(D)B- A+C
17. There are any three points on the plane, after which the number of straight lines can be drawn ()
(A) 1 (B) 3 (C) 1 or 3 (D) countless.
18.A and b are reciprocal, and x and y are reciprocal, so the value of (A+B) (X+Y)-AB is ().
(a) 0 (b) 1 (c)- 1 (d) cannot be determined.
19. Among the following groups, the group that correctly judges the size relationship is ().
(A)(-2)3>-23 (B)(-2)2< 22)
(C) - >- (D)(-2)3>(-2)2
20. If the single digit of a two-digit number is A and the ten-digit number is B, then this two-digit number can be expressed as ().
(A)A+B(B)ba(C) 10b+A(D) 10a+B
2 1. The cube shown in the figure, if expanded, can be () in the figure below.
(A) (B) (C) (D)
22. In the drawing, ∠ 1 and ∠2 are at the same angle ().
(A)①、② (B)①、③ (C)②、③ (D)②、④
① ② ③ ④
Third, do the math! Do not make mistakes! ! !
23. Calculation: (3 points for each question, *** 12 points)
( 1) (2)- 14+50÷22×(― )
(3) (4)0÷(-5)- 53- 5
Fourth, know the map calculation: be sure to look! ! ! (3 points for each question, ***6 points)
24. As shown in the figure, given that the line segment AB = 10㎝, and C is the midpoint of AB, find the length of AC;
25. As shown in the figure, it is known that: AD//BC, 1 = C, B = 60o, and the degree of c is found;
Verb (abbreviation of verb) explanation: (***4 points)
26. It is known that B, A and E are in a straight line, 1 = B Q: Is C equal to 2? Why?
Sixth, inquiry questions: have a look, don't be confused! ! ! (4 points for 27 questions, 5 points for 28 and 29 questions, *** 14 points)
27. Observe the graph and answer the question: What are the conditions for doing AD//BC?
(Requirements: Find at least 5 conditions)
Answer: ① ②
③ ④
⑤
28. There is a question: "Calculate (2x-3x y-2xy )-(x-2xy+y )+(- x).
+3x y-y), where x =, y =- 1. "A classmate copied" x = "by mistake.
"x =-", but his calculation result is also correct. Try to explain why? And find this result?
29. The total length of the Great Wall in Wan Li is one kilometer, and the length of a brick is b meters. How many bricks does Qin Shihuang need to repair the first floor of the Great Wall? If the total length of the Great Wall is 4,500 kilometers and the brick length is 15 cm, how many bricks does a floor need?
Is it a surprise for you? Pay attention to unit conversion)