I. Fill in the blanks (25 points)

1, 3456 cubic centimeters = () liters 6.6 hours = () hours () minutes.

2. Red family should plant several saplings, and the survival rate of these saplings is generally 75%-80%. If you want to plant 1000 seedlings, you should plant at least () seedlings.

3. According to the information of the Ministry of Information Industry, by 2008 1 month, the total number of mobile phone users in China had reached 555.769 million, and this figure was read as (), rounding off the mantissa after "ten thousand".

The decimal unit of 4 and 3 is (), and the unit such as () is the smallest composite number.

5. There are 3 tons of coal in the canteen, burning 3/7 tons a day on average, which can burn for () days.

6. Cut the 3-meter-long rope into 7 sections on average, with the fifth section accounting for () of the total length and () meters long.

7. The ratio of1:is (), and the ratio of 4: 9.8 to the simplest integer is (): ().

8. The bottom diameter of the pool is 16M and the height is 2M. Now the bottom and side should be tiled, and the tiled area is () square meters. If it is filled with water, the water surface is 2m away from the edge of the pool, and the water is () cubic meters.

9. There is a machine part 5 mm long and 2 cm long on the design paper. The scale of this picture is ().

10, Xiaodong, Xiaoming and Xiaojun practice playing table tennis at the same table. They took turns playing for an hour, with an average of () minutes each.

1 1，3 ÷ 8 = 15: () = ()% = () fold

13, 8 pigeons fly back to three dovecotes, and at least () pigeons will fly into the same dovecote.

14. A piece of square silk cloth can be made into a small handkerchief with a side length of 18 cm or a generous handkerchief with a side length of 27 cm, with nothing left. The side length of this square cloth is at least () cm.

15, the degree ratio of three internal angles of a triangle is 1: 1: 2, and this triangle is a () triangle.

16. Among the four numbers 1/7, 0. 142, 14.3%, 0.11,the largest number is ().

17, Xiaogang domestic white rabbit and black rabbit *** 184, white rabbit is more than 4/5 of black rabbit, Xiaogang domestic white rabbit ().

18, someone's ID number is 612323199807190094, and this person's date of birth is () and his sex is ().

Second, the choice (10)

1, a bottle of oil is 4/5 Jin. Pour out its 1/5 first, and then add 1/5 Jin to the bottle. Now there is more oil in the bottle than before ().

A, increase B, decrease C, unchanged

2. () The shape is stable. A, square b, rectangle c, trapezoid d, triangle

3, the volume of the cone is certain, its bottom area and height ().

A, proportional to B, inversely proportional to C, disproportional to D, uncertain

4. In the figure below, () is not an axisymmetric figure.

5. The ratio of the number of girls and boys participating in a math contest is 1∶3, and the average score of this contest is 82, of which the average score of boys is 80 and the average score of girls is ().

A.82, B. 86, C. 87 and D.88

6. After three coin flips, two heads are up and 1 tails are up, so the possibility of the fourth coin flip is () a.1/4b.1/2c.2/3d.1/3.

7. The geometry on the right consists of seven cubes. Seen from the front, the plane figure that can be drawn is ().

8. There are 8 chickens and rabbits a * * *, including 22 legs, including rabbits ().

A, there are three B's, four C's and five D's. I'm not sure how many.

9, m, n is a nonzero natural number, m ÷ n = 1... 1, then the greatest common factor of m and n is ().

A. 1

Table tennis has 10 and 13, of which 12 has the same mass and the other one is lighter. If you weigh it with a balance, you can find this table tennis at least () times.

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

Three. Judgment (5 points)

1, in 8.2, -4, 0, 6 and -27, there are three negative numbers. ( )

2. Draw a 60 angle on the paper according to the ratio of 1: 10, and the angle on the paper is still 60. ( )

There are 1000 red balls and a white ball in the box. Feel out 1 ball at will, it can't be a white ball. ( )

4. Class 1, Grade 6, has 2 people on leave and 48 people on duty. The attendance rate on this day is 96%. ( )

5. If 3a = 4b (a ≠ 0, b≠0), then a: b = 3: 4. ( )

IV. Calculate (2 1) 1 and write directly (4 points).

822- 199= 7÷ 1.4= 0. 18× 10= 7/ 10 ÷2 =

2. Calculate with an appropriate method. (6 points)

3.5× 128+350×0.72 54.2-2/9+4.8- 1 0.7÷[(5/6- 1/4)×24]

3. Find the value of unknown x (4 points)

( 1)4.8÷ 120% x = 40(2)6/7x+4.8 = 5

4. Column calculation. (2 points for each small question, ***4 points)

What is the quotient of the difference between (1) 125 and its 4/5 divided by 0.6? (2) A number of1/4 is that 1.2 is greater than 2.8. Find this number.

5. Find the area of the shaded part in the figure. (Unit: cm) (3 points)

Look at the picture and answer the questions. (3 points)

As shown above, the horizontal axis represents the travel time in Chen Xiao, and the vertical axis represents the distance from home to the library.

Please observe the above picture carefully, as can be seen from the line chart given:

Chen Xiao spent () minutes in the library. The speed of going there is () kilometers per hour.

(3) When returning, the speed is () km/h.

Sixth, solve the problem.

(1) Only the formula is not counted: (10)

1. Xiaohong reads a story book. She reads 18 pages every day for the first five days and 2 10 pages for the last nine days. How many pages does Xiaohong read on average every day?

2. The two trains A and B leave from two cities with a distance of 1620km at the same time, and meet after 6 hours. It is known that car A is faster than car B per hour 1/4. What's the speed of car B?

There are 840 kilograms of rice in the canteen. The weight ratio of rice to flour is 5:2. How many kilograms of flour are there?

4. The school organized "Red Cross" donation activities, and the sixth-grade students donated * * * to 650 yuan, less than the fifth-grade students 150 yuan. How much do fifth-grade students donate?

(2) Complete answer (26 points)

1. The construction team plans to lay 2400 meters of rails in 50 days. Actually,12m is laid more than planned every day. How many days does it actually take to complete the laying of this track?

2. After the cylinder with a length of 60 cm is cut into two small cylinders with a length of 1 2, the total surface area is increased by 30 square centimeters. What is the volume of a longer cylinder in cubic centimeters?

Xincheng Cement Factory produced 2700 tons of cement in March this year, 450 tons more than planned. What percentage?

4. Cone-shaped wheat pile, bottom circumference 12.56 m, height10.5 m ... Each cubic meter of wheat weighs about 750 kg. How much does this pile of wheat weigh? 6 points

5. An expressway has been repaired by 2/5 of it, and it can be repaired to half of its total length after another 300 meters. What is the total length of the highway?

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