1. 18304090, write (), omit the mantissa after 100 million, and the approximate value is ().

2.5.07 tons = () kg, 2.8 liters = () ml.

The decimal unit of 3.5/9 is (), and it has () such units, plus () such units is 1.

4. Between 6/7, 0.8, 83% and 0. , the largest number is (), the smallest number is ().

There is student A in our school. In the 6th Art Festival, 4/7 students performed on stage, and () students performed on stage.

6. The circumference of a circle is 3 1.4 cm, and its area is () square cm.

7. Make a cuboid with three cubes 2 meters long. The cuboid has a volume of () cubic decimeter and a surface area of () square decimeter.

The ratio of 8.2: 2/3 to the simplest integer is ().

9. Choose four natural numbers from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. The composition ratio is ().

On June 8th, 2004, transit of venus started at 13: 12 and ended at 19: 19. This "once-in-a-century rare astronomical phenomenon" has passed from beginning to end ().

1 1. We have learned four operations:+,-,× and ÷. It is now stipulated that "*" is a new operation. A * b stands for 2a-b, such as 4 * 3 = 4× 2-3 = 5. Then 9 * 6 = ().

12. From 3: 00 to 3: 30, the minute hand on the clock turned () degrees and the hour hand turned () degrees.

Second, choose the serial number of the correct answer and fill in ().

1. If a×b=0, then ().

1A = 02B = 03A and B are both 04A, and one of them must be 0.

2. 1, 3 and 7 are both () of 2 1.

① prime factor ② common divisor ③ odd number ④ divisor

3. Two iron wires with the same length of 8 meters, cut 3/8 from the first one and 3/8 meters from the second one. The rest ().

① It is impossible to compare ② The first root length ③ The second root length ④ The length is equal.

The route of the Beijing torch relay for the 2004 Athens Olympic Games is shown in the figure (omitted). According to this map (scale:1:280000), the distance of the torch relay from the east gate of the Great Hall of the People to the Summer Palace is about ().

① 5500m ② 328km ③ 55km ④ 6km.

Third, simple calculation.

57.5-4.25- 15.75 125×32 5/7× 16.3 1-5/7×2.3 1

Fourth, off-type calculation.

6760÷ 13+ 17×25 4.82-5.2÷0.8×0.6

5/6-3/4÷3/ 10 35÷7/8× 1-2/7

Fifth, solve the equation.

3.2x-4×3=52 x∶ 1.2=3∶4

Sixth, draw pictures.

Please draw a parallelogram in the square first, and then draw a trapezoid with the same area. (Figure omitted)

Seven, the application problem.

1. This year, the number of applicants for the national college entrance examination reached 7 million, a record high. National colleges and universities plan to enroll 4 million students. What percentage of registered students have participated in this program? (Keep one decimal place before the percent sign)

2. The train speed 1 10 km/h, and the plane speed of 20 km/h is less than 8 times that of the train. Find the speed of the plane.

3. The area of the combined graph (sketch)

4. Uncle Zhang deposited 5000 yuan 1 year (annual interest rate 1.98%) in the bank. According to national regulations, the interest earned shall be subject to interest tax of 20%. How much interest did Uncle Zhang actually earn after the expiration?

5. The following figure is the statistical chart of the world's largest crude oil producer and oil consumer in 2003 (omitted). (Unit: million tons)

(1) China is the largest crude oil producer and oil consumer in the world. In 2003, China needed to import one million tons of oil.

(2) The United States is the largest oil consumer in the world. In 2003, the oil consumption of the United States was roughly equivalent to the crude oil output of several countries such as ().

6. Mathematical problems about toothpaste.

(1) Xiaohong goes to buy toothpaste. The price of two specifications of toothpaste of the same brand is as follows: 120g, each 9 yuan; 160g, each 1 1.2 yuan. Which size of toothpaste is more economical for her to buy? Why?

(2) Toothpaste outlet diameter is 5mm, and Xiaohong squeezes out toothpaste every time she brushes her teeth 1cm. This toothpaste can be used for 36 times. The new packaging of this brand of toothpaste only changes the outlet diameter to 6mm, and Xiaohong still extrudes toothpaste with the length of 1cm every time as usual. So, how many times can I use this toothpaste? What do you think after the calculation?