The reciprocal of 1 Is _ _ _ _, the reciprocal is, and the absolute value is;

2. Expressed by scientific notation: 570000 = _ _ _ _ _;

3. The reciprocal of = is |1-| =;

4. The cube root of is, and the square root of is;

5. The divisor 1999.9 has three significant digits, which are expressed as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ by scientific counting method;

6. The square root of is _ _ _ _ _;

7. Calculation:;

8. The position of the real number p on the number axis is shown in figure 1, which is simplified by _ _ _ _ _ _ _ _ _ _ _ _ _ _;

9. Please follow the following formula before filling in the blanks:

, .

( 1)8× ;

(2)-( )=8×4;

(3)( )-9=8×5;

(4)-( )=8× ; ……

10. Observe the following equations: ×2 = +2, ×3 = +3, ×4 = +4, ×5 = +5, let represent a positive integer, and use related equations to express this rule as _ _ _ _ _ _ _ _;

2. Multiple choice questions:

1 1. Calculation: = ()

(A) (B) (C) or (d)

The square root of 12.9 is ()

(1). Article 3 (b). -3 (C)。 Paragraph 3 (d). 8 1

13.0.00032 is expressed in scientific notation, and the correct one is ().

(1). (2). (3). (4).

14. In the real number π, 2, and tan45, the number of rational numbers is ().

2 (B) 3 (C) 4 (D) 5。

15.0.00898 is expressed as () by scientific notation.

(A)8.98× 10-3(B)0.898× 10-3(C)8.98× 10-4(D)0.898× 10-4

16. Observe the operations of the following questions: ①, ②, ③ (sin225+sin265-t (a) n225) 0 =1,④, ⑤ (-7) 2 = 14, ⑤ | 4-7.

(A) ③⑤ (B) ②⑥ (C)③④⑤⑥ (D)⑤⑥

17. The following calculation is correct ()

(A) (B)

(C) (D)

18. The following scientific symbols are correct ()

(A) (B) (C) (D)

19. It is estimated that the average daily economic loss caused by land desertification in China is 15000000 yuan. If not treated, the economic loss caused by land desertification in China in one year (expressed by scientific notation) is ().

(A) 5.475× 107 yuan (B) 5.475× 109 yuan (c) 5.475× 1065438 yuan (d) 5.475× 1065438 yuan.

20.π, (c) The number of irrational numbers in C)COS300,,, 0.3030030003 ... is ().

2 (B) 3 (C) 4 (D) 5。

2 1. As shown in the figure, make a square with the unit long line segment of the number axis as the edge, take the origin of the number axis as the rotation center, and rotate the diagonal line passing through the origin clockwise, so that the other endpoint of the diagonal line falls on the point A of the positive semi-axis of the number axis, then the number represented by the point A is ().

1.4 (C) (D)

22. In the real number-,0, -3. 14, the irrational number is ().

1 (B)2 (C)3 (D)4。

23. China's oil output in a certain year is about 170000000 tons, which is expressed by scientific notation as ().

(a) 1.7× 10t(b) 1.7× 10t(c) 1.7× 10t(D) 1.7× 10。

24. In the following quadratic formula, similar to quadratic formula is ().

(A) (B) (C) (D)

25. In the following types, the quadratic radical of the same kind is ().

(A) (B) (C) (D)

26. In the following calculation, the correct one is ().

(A) (B) (C) (D)

3. Calculation problems:

27.

28.

29.

30.

3 1.

32.

33.

34. Observe the graph carefully, analyze all kinds carefully, and then answer the question:

(1) Please use an equation containing n(n is a positive integer) to express the above change law;

(2) calculate the length of OA 10;

(3) Calculated value.

Reference answer:

Fill in the blanks

1.,,; 2.3.,,; 4.,; 5.； 6.； 7.； 8.9.( 1); (2); (3); (4),; 10.；

2. Multiple choice problem

1 1.(D) Provide information; 12.(C) and: 13. (1); 14.(B) and: 15. (1); 16.(C) and: 17.(C) 18. (d) providing information; 19.(C) and: 20.(C) and: 2 1.(D) provide information; 22. (1); 23.(C) and: 24.(D) Providing information; (b) and: 26.(C) and:

Three. calculate

27.； 28.； 29.； 30.； 3 1.； 32.； 33.；

34.( 1); (2) The length of OA10 is; (3);