1. Multiple choice questions: (4 points for each small question, ***32 points)

(1) In the following categories, the formula that does not belong to the equation is ().

(A)3+2 = 6； (B)5+ 10 >2 ; (C)8+2 = 10； (D) 100/4=25

(2) In the following statement, the correct one is ()

(a) The equation is an equation; (b) the equation is an equation;

(c) Equations containing letters are equations; (d) An equation without letters is an equation.

(3) When the contemporary number expression is 4, the value of a is ().

(A)-4； (B)-3； (C)3; (D)2 .

(4) Last month, the turnover of a shopping mall was 10000 yuan, and this month's turnover increased by 15%, so this month's turnover is ().

(1) Ten thousand yuan; (b) Ten thousand yuan;

(c) Ten thousand yuan; (d) ten thousand yuan.

(5) If it is the solution of the equation, then the value of ().

(1); (B)5； (C) 1； (4)

(6) The solution of the equation is ()

(A)x =； (b) and: x = (c) x =; x=6

(7) Students, with every 10 person as a group, and each of the two groups has 1 person less, then students * * * have ().

(a) associations; (b) associations; (c) associations; Group (d)

(8) The value equivalent to () in the following formula is ().

(1); (b) and: (c) and: (iv)

2. Fill in the blanks: (2 points for each question, ***20 points)

1) For the equation 4x=-2x-6, the shift term, get, merge similar terms, get, and the coefficient is 1, get.

2) If the equation _ _ _ _ _ _.

3) When K=, the value of algebraic expression 2K+(5+3K) is 0.

4) If 2a2bm+ 1 and a2b2m- 1 are similar terms, then m=.

5) Fractionate the following components in integer form:

; ; .

6) If the sum of the number A and twice the number is 20 and the number B is represented by X, then the number A should be represented as.

3. Solving equation problems: (6 points for each small question, 30 points for * * *)

(1) 7x = 5+4x (test) (2) 7x-(x-5) = 4x- 1.

(3) (4)0.2X-0. 1=2X

(5)

4. Solving application problems with equations: (3 points for each small question, *** 18 points)

(1) There is a water tank. If the single pipe of the water tank is filled for 2 hours, the single pipe of the water tank is filled for 5 hours. Tube a and tube b are filled with water at the same time. How long does it take to fill the swimming pool?

(2) There is a pool. If the single pipe is opened for 2 hours, the single pipe is opened for 5 hours, and the single pipe is opened for 3 hours. How many hours does it take to fill an empty pool with water if three pipes are opened at the same time?

(3) For a two-digit number, the number in the tenth digit is smaller than the number in the first digit. 2. If the number in the tenth digit is reversed from the number in the first digit, the new number is twice smaller than the original number. 6. Find the original two digits.

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