Grade two math score unit test paper and answer.

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

1. The following rational expression: The score is _ _ _ _ _ _ _ _.

2. When _ _ _ _ _ _ _, the score is meaningful.

3. When _ _ _ _ _ _ _, the value of the score is zero.

4. Without changing the value of the fraction, all the coefficients of the numerator and denominator of the fraction become integers, and _ _ _ _ _ _ _ _

5. Fractions and the simplest common denominator are _ _ _ _ _ _ _.

6. Simplification: _ _ _ _ _ _.

7. If the score is equal to the value of, then x = _ _ _ _ _ _ _ _

8. When m = _ _ _ _ _ _ _ the root of the equation is.

9. If the equation has an increasing root, then a = _ _ _ _ _ _ _ _

10. Party A and Party B type a manuscript on the computer together. After 4 hours, Party A has another task, and the remaining 6 hours will be completed by Party B alone. It is known that it takes 7.5 hours for Party A to type a manuscript for 6 hours. If it takes X hours for Party A to complete it alone, the equation _ _ _ _ _ _ can be listed according to the meaning of the question.

Second, multiple-choice questions (3 points for each question, ***30 points)

1 1. If the score is 0, then A and B satisfy ().

A.a=2bB.a≠ a bC.a=2b and a≠ a bD.a= a 6.

12. Among the scores, the simplest score is ().

A.4 B.3 C.2 D. 1

13. The score is equal to ()

Asian Development Bank.

14. If both x and y in the score are enlarged by 2 times, the value of the score ().

A. expand to twice the original B. unchanged

C. reduce it to 2 times. D. reduce it to 4 times.

15. The following calculation is correct ()

A.B

CD。

16. The calculation result is ()

Asian Development Bank.

17. The value satisfying the equation is ().

A.0B. 1C.2D number

18. To make the sum reciprocal, the value of is ().

A.0B 1C。 D. 1

19. If the equation about =0 has an increasing root, the value of is ().

a . 1 1b . 3c . 9d . 13

20. Party A and Party B contract a task, which can be completed in 5 days. If they do it alone, it takes Party A 4 days less than Party B and it takes X days for Party A to do it alone, then the equation can be listed as ().

A.B

CD。

Iii. Answering questions (***50 points)

2 1. Calculation (4 points for each question, *** 16 points)

( 1)(2);

22. Solve the fractional equation (5 points for each question, *** 10)

( 1)(2).

23.(6 points) Simplify before evaluating: where a = 1 2 and b =11.

24.(6 points) It is known that X and Y satisfy the evaluation.

25.(6 points) Students of a certain grade go out for a spring outing by car. It is estimated that the travel expenses of * * * will be 23,700 yuan, and 50 people will be added before departure, so the total expenses will be 27,650 yuan. How many students were going to take part in the spring outing?

26.(6 points) Prepare new paint with paint worth 65,438+000 yuan and paint worth 240 yuan.

Its price per kilogram is less than that of coating A by 3 yuan and more than that of coating B 1 yuan.

The total value of the new paint remains unchanged. How much is this paint per kilogram?

Reference answer

1.2.3.4.

5.6. 17.68.29.4

10.

1 1.C 12。 C 13。 D 14。 B 15。 C 16。 A

17.A 18。 B 19。 B20.C

2 1.( 1)2(2)(3)-(x+ 1)(4)3

22.( 1)(2)x= 15

23.2