(Full score 100, test time is 90 minutes)

Class name, student number score

I. Multiple-choice questions: (3 points for each question, ***24 points)

1, the correct deformation number of the following equation is ().

(1) from 3+x=5, x = 5+3; (2) From 7x= -4, x =；;

(3)y = 2 from； (4) x= -2-3 from 3 = x-2;

a、 1 B、2 C、3 D、0

2. The purchase price of a commodity is 1.200 yuan, and the price is 1.575 yuan. Later, due to the backlog of this product, the store was prepared to sell it at a discount, but if the profit is not less than%, you can play at most ().

A, 60% off B, 70% off C, 80% off D, 10% off

3, in order to solve the problem of high drug prices, decided to significantly reduce drug prices, including a common drug price reduction of 40%, the price of this drug after the price reduction is ().

A, b, c, 60% A, d and 40% a.

4, the following statement, the correct is ()

A, the algebraic expression is equation B, and the equation is algebraic expression.

C, the equation is equation D, and the equation is equation.

5. The same equation as the solution of the equation is ()

A, B, C, D,

6. The difference between a number and 2 is equal to half of this number. This number is ()

a、 12 B、– 12 C、 18 D、– 18

7. My mother got married at the age of 26. The next year she gave birth to a son. A few years later, the mother is three times as old as her son. At this point, my mother's age is ().

A, 39 years old B, 42 years old C, 45 years old D, 48 years old

8.a and B are 240 kilometers apart, and it takes 4 hours for the train to travel at the original speed. After the train speeds up, the speed is 30% faster than before, so it only needs ().

A, Shi B, Shi C, Shi Ding, Shi

Fill in the blanks (4 points for each question, 32 points for * * *)

9. If x=4 is the solution of the equation ax=a+4, then the value of a is _ _ _ _ _.

10, when x=, the value of algebraic expression 4x-5 is equal to 7.

1 1, the known number a is twice that of the number b, 1, and if the number a is x, the number b can be expressed as _ _ _ _ _ _ _; If the number b is y, then the number a can be expressed as _ _ _ _ _ _ _ _.

12, the ratio of boys to girls in Grade 1 (3) is 5: 4. If the number of boys is A, then the number of girls is 60, and there are students in the class.

Huanhuan's birthday is in August. In this year's August calendar, the sum of the four dates of Huanhuan's birthday is 76, so Huanhuan's birthday is the date of this month.

14. A factory is expected to increase production by 15% this year compared with last year, reaching an annual output of 600,000 tons. If the annual output last year was x million tons, an equation can be established.

15, two cars, A and B, set off in the same direction at the same time from two stations 400 meters apart. Two hours later, Car A overtook Car B.. If the speed of car A is one kilometer/hour, the speed of car B is;

16, from a to b, it takes 7 hours by bus. After the opening of the expressway, the average speed has increased by 20 kilometers per hour, and it only takes 5 hours to get there. The distance between a and b is:

Iii. Answering questions (***44 points)

17, solve the following equation (5 points for each question, *** 10)

( 1) (2)

What are the values of 18 and (6 points), and the algebraic value is equal to 3?

19, (7 points) A certain store first increases the original selling price of a certain color TV by 40%, and then writes "big reward, 20% discount" in the advertisement. After the customer complains, the law enforcement department will impose a fine of 2700 yuan per set according to 10 times of the illegal income, and recover the original price of each color TV.

20.(7 points) Xiaoming's father saved 3,000 yuan for Xiaoming's education three years ago. Due this year, the total principal and interest is 3243 yuan. Please help Xiao Ming calculate the annual interest rate of this savings.

2 1, (7 points). In social practice, three students A, B and C from a school investigated the traffic flow (the number of cars passing through the observation point every hour) during the peak hours of the Second Ring Road, the Third Ring Road and the Fourth Ring Road in Beijing. The three students reported the traffic flow during the peak hours, as follows:

A classmate said, "The traffic volume of the Second Ring Road is/10 000 vehicles per hour." .

Student B said, "The traffic on the Fourth Ring Road is 2000 more than that on the Third Ring Road every hour."

Student C said, "The traffic flow difference between the Third Ring Road and the Fourth Ring Road is twice that of the Second Ring Road." .

According to the information provided by them, please find out the traffic volume during the peak hours of the Third Ring Road and the Fourth Ring Road.

Unit test answer

First, multiple choice questions

1、D 2、C 3、C 4、D 5、A 6、B 7、A 8、B

Second, fill in the blanks

9， 10，3 1 1，2X+ 1， 12， 13， 19 14，( 1+65438。

Third, answer questions.

17, (1) x =11(2) x = 018, x=5 19, and the original price of each color TV is 2250 yuan. 20. The annual interest rate of this deposit is 2.7%.