1. In the following formula, the number of fractions is ()
, , , , , .
A.3 B.4 C.5 D.6
2. According to the basic nature of the score, the score can be converted into ()
A.B. C. D。
3. Among the following equations about x, the one that is not a fractional equation is ().
A.B. C. D。
4. If is, it is equal to ()
A.B. C. D。
5. In the following equation, where y is the inverse proportional function of x, it is ().
A.B. C. D。
6. It is known that the image of the inverse proportional function passes through point (a, b), so its image must also pass through point ().
A.(-a，-b) B.(a，-b)c .(a，b) D.(b，-a)
7. A driver drives a car from place A to place B and travels at an average speed of 80 km/h for 6 hours to reach his destination. When he returns at the same speed, the functional relationship between the speed v (km/h) of the car and the time t (h) is ().
A.B. C. D。
8. If the known points (-1, a), (1, b) and (3, c) are all on the image of the inverse proportional function, then ().
a > b > c b . a > c > b . c . c > b > a d . b > c > a
9. In the triangle with the following lines A, B and C as three sides, the one that cannot form a right triangle is ().
A.a=9，b=4 1，c=40 B.a=b=5，c=
c . a∶b∶c = 3∶4∶5d . a = 1 1，b= 12，c= 15
10. If three sides of a right triangle are three consecutive even numbers, then the length of its hypotenuse is ().
A.6 B.8 C. 10 D. 12
1 1. If in △ABC, AB= 13, AC = 15 and AD= 12, the length of BC is ().
A. 14b.4c. 14 or 4d. None of the above is correct.
12. A 25-decimeter-long ladder stands obliquely on a vertical wall. At this point, the foot of the ladder is 7 meters away from the bottom of the wall. If the top of the ladder slides down 4 meters along the wall, the bottom of the ladder will also slide ().
A.9 decimeter B. 15 decimeter c.5 decimeter d.8 decimeter
Fill in the blanks (3 points for each small question, *** 12 points)
13. expressed in scientific notation: 0.0000012 = _ _ _ _ _ _ _ _ _.
14. If the score is meaningful, the value range of x is _ _ _ _ _ _ _ _.
15. The image of the inverse proportional function is in the _ _ _ _ _ _ _ _ quadrant.
16. If the ratio of three sides of a triangle is 5∶ 12∶ 13 and the circumference is 60cm, its area is _ _ _ _ _ _ _ _ cm2.
Third, solve the problem (8 points for each small question, 72 points for * * *)
17. Calculation:
18. Calculation:
19. Solve the equation:
20. The time it takes a ship to sail 46 kilometers downstream and 34 kilometers upstream is exactly equal to the time it takes a ship to sail 80 kilometers in still water. Assuming that the current speed is 3 kilometers per hour, find the speed of the ship sailing in still water.
2 1. The image of the known inverse proportional function passes through point A (-1, 4).
(1) which quadrant is the image of this function located in? How does y change with the increase of x?
(2) Are points B(2, -2), C (,-16) and D (-4,-1) on the image of this function?
22. It is known that the linear function and the inverse proportional function intersect at points A(4, m) and B (-2, n).
(1) Find the values of m, n and k; ⑵ Write the solution set of inequality about x directly from the image.
First, multiple-choice questions (3 points for each small question, 36 points for * * *)
1. In the following formula, the number of fractions is ()
, , , , , .
A.3 B.4 C.5 D.6
2. According to the basic nature of the score, the score can be converted into ()
A.B. C. D。
3. Among the following equations about x, the one that is not a fractional equation is ().
A.B. C. D。
4. If is, it is equal to ()
A.B. C. D。
5. In the following equation, where y is the inverse proportional function of x, it is ().
A.B. C. D。
6. It is known that the image of the inverse proportional function passes through point (a, b), so its image must also pass through point ().
A.(-a，-b) B.(a，-b)c .(a，b) D.(b，-a)
7. A driver drives a car from place A to place B and travels at an average speed of 80 km/h for 6 hours to reach his destination. When he returns at the same speed, the functional relationship between the speed v (km/h) of the car and the time t (h) is ().
A.B. C. D。
8. If the known points (-1, a), (1, b) and (3, c) are all on the image of the inverse proportional function, then ().
a > b > c > b > a > c > b
9. In the triangle with the following lines A, B and C as three sides, the one that cannot form a right triangle is ().
A.a=9，b=4 1，c=40 B.a=b=5，c=
c . a∶b∶c = 3∶4∶5d . a = 1 1，b= 12，c= 15
10. If three sides of a right triangle are three consecutive even numbers, then the length of its hypotenuse is ().
A.6 B.8 C. 10 D. 12
1 1. If in △ABC, AB= 13, AC = 15 and AD= 12, the length of BC is ().
A. 14b.4c. 14 or 4d. None of the above is correct.
12. A 25-decimeter-long ladder stands obliquely on a vertical wall. At this point, the foot of the ladder is 7 meters away from the bottom of the wall. If the top of the ladder slides down 4 meters along the wall, the bottom of the ladder will also slide ().
A.9 decimeter B. 15 decimeter c.5 decimeter d.8 decimeter
Fill in the blanks (3 points for each small question, *** 12 points)
13. expressed in scientific notation: 0.0000012 = _ _ _ _ _ _ _ _ _.
14. If the score is meaningful, the value range of x is _ _ _ _ _ _ _ _.
15. The image of the inverse proportional function is in the _ _ _ _ _ _ _ _ quadrant.
16. If the ratio of three sides of a triangle is 5∶ 12∶ 13 and the circumference is 60cm, its area is _ _ _ _ _ _ _ _ cm2.
Third, solve the problem (8 points for each small question, 72 points for * * *)
17. Calculation:
18. Calculation:
19. Solve the equation:
20. The time it takes a ship to sail 46 kilometers downstream and 34 kilometers upstream is exactly equal to the time it takes a ship to sail 80 kilometers in still water. Assuming that the current speed is 3 kilometers per hour, find the speed of the ship sailing in still water.
2 1. The image of the known inverse proportional function passes through point A (-1, 4).
(1) which quadrant is the image of this function located in? How does y change with the increase of x?
(2) Are points B(2, -2), C (,-16) and D (-4,-1) on the image of this function?
22. It is known that the linear function and the inverse proportional function intersect at points A(4, m) and B (-2, n).
(1) Find the values of m, n and k; ⑵ Write the solution set of inequality about x directly from the image.