1. expressed in scientific notation:? .
2. If the deposit in 50 yuan is recorded as +50 yuan, then -80 yuan is to take out 80 yuan.
3.？ The absolute value of is.
4.？ The reciprocal of is.
5. Expressed by inequality: "The sum of A and 5 is greater than".
6. Comparative size:-(-11)+(-1.5)
7. Calculation: =.
8. In the equation, the coefficient of the term is and the degree is.
9. Solve equations:,.
10. If m < n and p≤0, MP _ _ _ _ NP (fill in unequal symbols ",≤" and ≥ ").
11."4 times the sum of x and 9 equals the difference of x minus 15", and the equation can be obtained.
12. Xiaoming and Xiaojie have 500 books. If Xiaojie gave Xiaoming 15 books, they would have as many books. Ask Xiao Ming if he has a book.
13. The age ratio of Party A, Party B and Party C is 3∶4∶5, and the sum of ages is 60 years old. Party B is 60*4/ 12 years old.
14. Xiaoming accidentally dropped two drops of ink on the number axis when doing his homework (pictured). According to the data in the figure, it is judged that the sum of the integers covered by ink is.
Second, multiple-choice questions (this big question * * *, a total of 4 questions, 2 points for each question, full score 12 points)
15. ........................................................................................................................................... of the product of rational number and its inverse number (3)
(a) It must be a positive number; (b) Must be negative;
(c) Must be a non-positive number; (d) Must be non-negative.
16. The deformation of the following inequality is correct. ........................... ()
Pass, get
Pass, get.
17. If the algebraic expression and the reciprocal are opposite, then the value of x is ........................ ().
1； (B)0； (c) and: (D)- 1.
18, there are 54 students in class A and 48 students in class B. If the number of students in class A is twice that of class B, and the number of students from class B to class A is X, the equation can be listed as .............................................................. ().
(1); (b) and:
(c) and: (4).
Third, the calculation questions, directly write the results (this big question * * *, a total of 4 questions, 2 points for each question, out of 8 points)
19、 .
20、 .
2 1、 .
22、 .
Fourth, solve the problem (there must be a problem-solving process, otherwise you won't score) (there are 5 questions in this big question, 6 points for each question, out of 30 points)
23、
24 calculation (simple and convenient):
25 solving equations:
26 solving equations:
27. If the root of the equation about is-1, what is the value?
Five, the application problem (this big problem * * * has 3 questions, out of 22 points)
28. Xiaojie chose a set of ***25 questions on the Internet to monitor students' quality. It is known that if he answers a question correctly, he will get 4 points; If he answers a question correctly, he will get 1 point; If he doesn't do three questions, he will get 73 points. Ask him * * * How many questions did he answer correctly?
Solve the problem and answer X correctly.
4x+22-x=73
x= 17
A pair of leather shoes is sold at cost plus 50%, and then sold at 25% of the selling price due to seasonal reasons. The new price after the reduction is a pair of 63 yuan. How much is this pair of leather shoes? How much can you earn per pair at the reduced new price? 63÷0.75÷ 1.5= cost
The maintenance team set out from place A to repair the east-west line. If eastbound driving is positive and westbound driving is negative, the driving record of one day is as follows (unit: km).
—4,+7,—9,+8,+6,—4,—3。
(1) How far is it from A when we call it a day? East 1 km
(2) What time is the farthest from A? The one with +6.
(3) If the fuel consumption per kilometer is 0.3 liters, how many liters will * * * consume from departure to work?
7+4+9+8+6+4+3}*3=