Fill in the blanks. (2 1%)

1. Use three "5" s and two "0" s to form a five-digit number according to the following requirements:

(1) only reads a zero (); (2) I can't read a zero.

2.4km 60m = () km1.25h = () min.

There are () divisors of 3.36 * *. Choose four of them to make the ratio of two ratios equal to, that is

The proportional formula is ().

4. The mantissa of a number with "10000" omitted is 80000, which is between () and ().

5. The simplest true score, the product of numerator and denominator is 24, and this true score is () or ().

6. Plant a tree seedling, the survival rate is 94%. In order to ensure the survival of 470 saplings, at least () saplings should be planted.

7. If you use a one-meter-long rope, there are () meters left; If you use it,

There are () meters left.

8. If you draw a square lawn map with a side length of 4 cm on the map with the scale of 1: 5000, the actual area of this lawn map is () square meters.

9. The concentration of the prepared liquid medicine is certain, and the dosage of water and medicine is directly proportional to (); Measure a distance in steps, and the average length of each step is proportional to the number of steps.

10. As shown in the left figure, the cylinder with the bottom circumference of 18.84cm and the height of 10cm is cut into several equal parts to form an approximate cuboid. The bottom area of this cuboid is () square centimeter, the surface area is () square centimeter and the volume is () cubic centimeter.

1 1. The inner diameter of the tap water pipe is 2 cm, and the flow rate of water in the pipe is 8 cm per second. A classmate went to wash his hands and forgot to turn off the tap when he left, wasting () water for 5 minutes.

12. The sum of all sides of a cuboid is 1.8m, and the aspect ratio is 6: 5: 4. Cut this cuboid into two small cuboids, and the surface area can be increased by () square meters at most.

Second, choose. (5%)

1. Divide the 45-meter-long rope into four parts on average, each part accounting for () of the whole length.

a、 15 B、 14 C、 15m d、 14m。

2. Tie a gift box with a ribbon, as shown below. This knot is 25 centimeters long. It is more reasonable to prepare () decimeter ribbons to bind this gift box.

A, 10 decimeter b, 2 1.5 decimeter c, 23 decimeter d, 30 decimeter.

As shown in the picture, there is a square piece of paper without a cover.

Box, marked with the letter "m" at the bottom, along Figure A B.

Cut it into a flat figure with thick lines.

I think it will (). C

There are 48 students in Class 4.6 (1) * *, and a learning goal will be chosen at the end of the term.

Soldiers, the election results are shown on the right, and the following figure () can show the results.

A B C D

5. Estimate the calculation results of the following four formulas, and the biggest one is ().

a . 888×( 1+)b . 888×( 1-)c . 888 \u( 1+)d . 888 \u( 1-)

Third, calculation. (27%)

1. Write the result directly. (6%)

23 - 12 = 4.5× 102= 59 ×6= 270÷ 18= 5-0.25+0.75=

0.42-0.32= 2÷ 15 = 34 1- 103= 13×(2+7 13 )= ( ): 17 = 17

10× 10%= 23.9÷8≈ 7× ÷7× = 1÷ × =

2. How to calculate simply? (9%)

78 ÷5+78 ÷2 1.05×(3.8-0.8)÷6.3 920 ÷[ 12 ×(25 +45 )]

3. Solve the equation (or proportion). (6%)

14x-0.75 = 12÷ 1.27 . 5 = 0.4x

4. Column calculation. (6%)

(1) A number is 60 more than it. Find this number. (2) What is the quotient of18 divided by 12?

Fourth, practice. (5%)

1. The picture on the right is a rectangle 3 cm long and 2 cm wide.

(1) Draw a line segment in the rectangle and divide it in two.

The largest isosceles right triangle and trapezoid.

(2) Find the area of this trapezoid.

(3) Rotate the triangle at high speed with the straight line where one right angle side of the isosceles right triangle is located as the axis to form the shape of (). Calculate the volume of this figure after rotation.

5. Statistical problems in life. (6%)

The following table is the statistics of the class size of the sixth grade in xinhua primary school. Please draw a histogram according to the data in the table.

Class 6 (1) Class 6 (2) Class 6 (3)

Boys 23 22 24

Girls 22 25 26

Draw a statistical chart according to the data and answer the questions.

Class (1) has the largest number of students, and * * * has () students.

(2) Category 6 (1) is equivalent to ()% of Category 6 (3).

(3) There are about () people in each class in the whole grade.

Sixth, solve the problem. (36%)

1. Only the formula (or equation) does not count.

2. The construction team planned to dig 800 meters of canal in 20 days, and actually completed the task in 16 days. What percentage of the actual work efficiency of the construction team has been improved compared with the plan?

3. An express train and a local train travel in the opposite direction from Nanjing and Yangzhou at the same time, and the passing time is 3 hours.

/kloc-meet at 0/000 meters. It is known that the average speed of the express train is 75 kilometers per hour, and how many kilometers is the average speed of the local train?

The above is a savings deposit certificate of Uncle Zhang. If he has to pay 20% interest tax at maturity, how much interest can he actually get when his deposit expires?

The volume of cylindrical glass is 65,438+0,000 cubic centimeters. Now the ratio of water height to water height is 1: 1. After putting into the cone (the cone is completely immersed in water), the ratio of water height to water height is 3: 2. What is the volume of this cone?

6. The number of days and daily wages for the three construction teams A, B and C to complete a project are as follows:

Total daily wages spent by the construction team to complete the project alone (ten thousand yuan)

One piece 10 18

B 15 12

C 20 8

Please choose two engineering teams to cooperate on this project. If the construction period is tight and you want to finish it as soon as possible, which two teams should you choose to cooperate with? How many days can it be finished? How much will each team get after completion?

(What are these? )