(Examination time 120 minutes, full mark 150 minutes) Proposer: Tang Huali.
First, multiple-choice questions (4 points for each small question, 40 points for * * *)
The reciprocal of 1 and -2 is ()
A.- 2nd century BC
2. Calculation: The result of -2+5 is ()
A.-7b-3c . 3d . 7
3,370,000 is expressed as () by scientific notation.
a . 37× 10b . 3.7× 10c . 0.37× 10d。 None of the above answers are correct.
4. The same item as -3ab is ()
3ab C. ab D.a b
5, the following equation is incorrect ()
A.(-3)=-3 b .-2 =(-2)c . |-3 | = | 3 | d .(-3)= 3
6. Simplification: The result of 6ab+ba+8ab is ()
a . 2ab b . 3c-3ab d . 3ab
7, the approximate number 0.03020 has several significant figures ()
1。
8. The single-phase -2xy coefficient and degree are () respectively.
Answer 2, 2 B2, 3. c-2，3d-2，2
9, the following calculation is correct ()
a . 3a-2a = 1 b .-m-m = m c . 2x+2x = 4x d . 7x y-7y x = 0
10, if a =, a =, a =, a = …, according to this law: a = ()
A.B. C. D。
Two. Fill in the blanks (4 points for each small question and 24 points for empty questions)
1 1、|-5|=________
12、-4 +2 =_______
13, the rational number with the smallest absolute value is _ _ _ _ _ _ _ _
14, the coefficient of algebraic expression-is _ _ _ _ _ _ _, and the degree is _ _ _ _ _ _.
15, the expression of the formula: the sum of 4 times of m and 1 times of n is _ _ _ _ _ _ _ _ _.
16, if x =- 1, then x+x+…+x = _ _ _ _ _ _
Third, the calculation problem (6 points for each small question, 24 points for * * *)
17、 (-5)×(-8)-(-28)÷4
18、 -9÷3+( - )× 12+3
19、 -2 -(-2) -2 ×(- 1)
20、 -( ) ×9-2(- )÷ +|-4|×0.5 +2 ×(- 1 )
Iv. Answer questions (score 10 for each small question, score ***40)
2 1, simplified 3m-2 (m-3n)
22. simplify 2AB+2AB-[2 (AB- 1)+2AB+2]
23, known as (x+3)+| y-6 | = 0 to find the value of x-y.
24. Simplified evaluation (-x+5+4x)-(4-5x+x), where x =-2.
Verb (abbreviation of verb) solving problems (each small question 10 score, ***22 score)
25. The elevation of a section of beach is12m, the nearby buildings are 50m, and a submarine in the sea is 30m. Now, based on the beach height, it is recorded as 0 meters. How to express the height of nearby buildings and submarines?
26. Shareholder Xiao Wang bought 1000 shares of a company at the closing price of 67 yuan last Friday. The following table shows the daily ups and downs of the stock this week:
Monday, Tuesday, Wednesday, Thursday and Friday.
Up and down per share/yuan +4+4.5- 1-2.5-6
(1) How much is the share at the close of trading on Wednesday?
(2) How much is the highest share this week? What is the lowest price?