1, the following is the binary linear equation ().

A.B. C. D。

2. Since it is a binary linear equation about x and y, the solution of m and n is ().

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

3. The solution of the equation is ().

A. One solution B. Two solutions C. No solution D. Countless

4, the following groups of values, the solution of the equation is a group of ()

A. in BC,

5. It can be concluded from the equation that the relationship between and is ().

A.B. C. D。

6. Party A and Party B start from the same place and go in the same direction. Party A rides a bike and Party B walks. If Party B walks one kilometer first, then Party A will catch up with Party B in an hour. If B walks a few hours first and A catches up with B in a few hours, then B's speed is ().

A. km/hour

C. km/hour

7, known as the solution of equations, then the value of ().

A.B. C. D。

8, if the solution of binary linear equations is the solution of binary linear equations, then ()

A.B. C. D。

9. If is, the value of is ().

A.0b.1c.2d. cannot be found.

10, if the equations have solutions, then the values of a and b should be ().

(A) a≠2, b is an arbitrary real number (b) A = 2, b≠0.

(c) A = 2, b≠2 (D) a and B are arbitrary real numbers.

Fill in the blanks (3 points for each small question, 30 points for * * *)

1, one solution of the equation is that the value is _ _ _ _ _.

2. Given a binary linear equation, if y is expressed by a formula containing x, then y = _ _ _ _ If the value of y is 2, then the value of x is _ _ _ _.

3. If, then _ _ _ _.

4. If both team A and team B have people, if people are transferred from team A to team B, the number of team A is half that of team B, and the equation can be _ _ _ _ _.

5. When _ _ _ _ _ _ _ _, the following equations ①, ② and ③ have a common * * * solution.

6. All positive integer solutions of binary linear equations are _ _ _ _.

7. If, then _ _ _ _.

8. The sum of numbers A, B and C is 35, where number A is twice that of number B and number B is equal to number C. Assuming that numbers A, B and C are x, y and z respectively, the equation is as follows.

9. The student asked the teacher, "How old are you this year?" The teacher said humorously, "you were born when I was your age;" I was 37 years old when you were my age. "So the age of the teacher now is _ _ _ _ _.

10, give the following program:

And it is known that when the input x value is 1, the output value is1; When the input value of x is-1, the output value is -3.

Then when the input value of x is 0, the output value is 0.

Third, answer questions.

1, and solve the following equation:

(1) (4 points)

(2) (4 points)

(3) (6 points)

Xiaoming has one yuan in his hand. When he passed by the shop, he wanted to change this RMB into RMB or RMB change. Please think it over. How many ways can the clerk change it? (5 points)

3. The business owner Xiong learned the following information in the vegetable wholesale market:

Vegetable variety red pepper cucumber tomato eggplant

Wholesale price (RMB/kg) 41.21.61.

Retail price (RMB/kg) 5 1.4 2.0 1.3

He * * * used 1 16 yuan to wholesale 44 kilograms of red peppers and tomatoes from the market and sell them in the vegetable market, which sold out on the same day. Please calculate how much money this bear can earn. (5 points)

Xiaoying and Xiao Qiang meet to go to the supermarket to buy their favorite walkman and schoolbag. Can you find out the unit price of their favorite walkman and schoolbag according to their conversation (as shown in Figure 3)? (5 points)

5. Three cases of hardcover apples, including two cases of * * * apples, two cases of * * * apples and two cases of * * * apples. How many flat fruits are there in each box? (6 points)

6. The ticket prices for scenic spots are as follows:

The number of ticket buyers1-50,51-100 or more.

Ticket price per person 13 yuan 1 1 Yuan 9 yuan.

On the second day of our school (1), (2) two classes *** 1 04 people are going to visit the scenic spot during the holiday, among which (1) class is less than 50 people, and (2) class is more than 50 people. It is estimated that if both classes buy tickets separately according to the class, then. What do you think is a good way to save the ticket cost? If so, please calculate how much money you can save according to your method. (7 points)

7. "Lihai" communication equipment shopping mall plans to buy a new type of mobile phone from the manufacturer in RMB to meet the market demand. It is known that the manufacturer produces three different models of mobile phones, the ex-factory price is RMB for type A, RMB for type B and RMB for type C. 。

(1) If the mall buys two different models of mobile phones at the same time and the RMB runs out, please help the mall figure out how to buy them.

(2) If the mall buys three different types of mobile phones at the same time and just runs out of yuan, it requires at least one type B mobile phone and no more than one type B mobile phone. Please find out the number of mobile phones of various models in the mall. (8 points)