1. The Pacific Ocean is the ocean in the world, with an area of179.609 million square kilometers. This number is written as () square kilometers, and the mantissa after omitting 10 thousand is about () square kilometers.
2.(): 15 = 0.6 = ()% = () fold
3. Cut a cylinder with a bottom radius of 5cm and a height of10cm into an approximate cuboid, and the surface area will be increased by () cm2.
4. Fill in the appropriate unit name in the brackets below.
Xiao Ming's home is not far from school, and it takes 8 () to walk; He drank a bottle of water from 500 yuan at school.
5. The construction site brought in 120 tons of cement, with an average of 8 tons per day. Used up, there are () tons left. There were () tons of cement left at that time.
6.A=2×3×5 and B=3×3×5, then the common factor of A and B is (), and the minimum common multiple is ().
7. Xiaohong 1.5 hours walks 6 kilometers, and his walking speed is 1 kilometer per hour; It takes () hours to walk 1 km.
8. The ratio of the number of pictures of Li Jia and Wang Min is 3: 5. If Li Jia has 24 pictures, Wang Min has (); If Li Jia has 30 pictures, and Wang Min gives Li Jia () one, the number of them will be the same.
9. The ratio of boys to girls in a school is 4: 5, and the number of girls is ()% more than that of boys.
10. The circumference of the cylinder bottom is 25. 12 cm, the height is 3 cm, and the volume is () cubic cm.
extreme
1, in -9, 3.8, 0, +5, -0. 185, positive numbers have () and negative numbers have (), where () is neither positive nor negative.
2. Shao Rui is 80m south, marked as +80m, and then 100m north, marked as ().
3, 450007020 is pronounced as (), and the mantissa after ten thousand is about ().
4.a, B, X and Y are all numbers that are not equal to 0. If 3a=4b, then a: b = (): (); If x= y, then x:y= (): ()
5. Choose four of the factors of 12 to make the ratio ().
6. 1 kg brine contains 50 grams of salt, which is ()% of brine.
7. The right sides of a right triangle are 6 cm and 8 cm respectively. After reducing it by 1:2, the graphic area is ().
8. For a pesticide, the ratio of pesticide to liquid is 1:3000, and the existing pesticide is 0. 1 kg, which requires () kg of water.
9. Two trains, A and B, leave from opposite directions at the same time. It is known that the speed of train A is100km, and that of train B is 90km. When they meet, the simplest integer ratio of the driving distance between car A and car B is (); The simplest integer ratio of the time required for a car to complete the journey by itself is ().
10, judge whether the two quantities in the following questions are proportional and what proportion, and fill in the serial number of the correct answer in brackets.
A, proportional to B, inversely proportional to C, out of proportion
(1), the daily work efficiency is certain, the number of workers and the total amount of work. ( )
(2) The former item of the ratio must be fixed, and the latter item is the same as the ratio. ( )
(3) the number and amount of subscriptions for Hainan Daily. ( )
(4), sugar water quality, sugar quality and water quality. ( )
(5) The surface area of a cube and the area of one of its faces. ( )
Tisso
1, 8,359,004 writing (), rounded to ten thousand places is about ().
2. 1.75 hours = () hours () 7800 square meters = () square kilometers.
3. Divide the 4-meter-long iron wire into five sections on average, with each section being () () kilometers long.
4. The unit of the score is 1 10, and the real score is (). It adds at least () such decimal units to become the smallest odd number.
5. The ratio of A to B is 8: 5, B is 25 and A is ().
6. In 25: x, when X= (), the ratio is 1, when X= (), the ratio is meaningless, and when X= (), it can be proportional to 23:2.
7.A is twice that of B and C is twice that of A, so A: B: C = ()
8. A worker produced 200 parts, four of which were unqualified, and the qualified rate was ()%.
9. A job takes 10 hours to complete its 5 12, and it takes 23 hours to complete it.
10, 3.45 hours = () hours () minutes 50 square meters = () hectares