Xiaohong, Xiaofang and Xiaoli take three of the nine cards written with 10, 20, 30, 40, 50, 60, 70, 80 and 90. The product of Xiaohong's three numbers is 48000, the sum of Xiaofang's three numbers is 150, and the product of Xiaoli's three numbers is 63000. Which three cards do they take?

Xiaofang's is 40 + 50 + 60 = 150, Xiaoli's is 10 * 70 * 90 = 63000, Xiaohong's is 30 * 80 * 20 = 48000

At present, there are 4 pieces of RMB per dime, 2 pieces of RMB per dime and 3 pieces of RMB per yuan, of which at least one piece and at most nine pieces can be taken. There are several different ways to calculate the amount of money

The total amount of money is 3.80 yuan, and the number of sheets is 9. If you take 1-9 sheets, the balance may be from 0 yuan to 3.70 yuan, a total of 38 possibilities
Since the dime is 0.40 yuan for the dime and 0.40 yuan for the dime, the total is 0.80 yuan. Without the dime, the balance can not be 0.90 yuan, 1.90 yuan and 2.90 yuan
There are several different kinds of money: 38 - 3 = 35

There are nine cards on the table, each with the numbers of 1-9
1. If the odd number Xiaoming wins and the even number Xiaohong wins, is the game fair? Is Xiaofang sure to lose?
Can you design a fair rule?

This game is not fair, but Xiao Fang is not sure to lose. There are 8 cards, 4 even numbers and 4 odd numbers on the table

Please, please, please
1. A copper cube with a mass of 8900g and a side length of 1dm is placed on a horizontal round stool with an area of 80cm2 to calculate the pressure of copper on the stool
2. For a container with a mass of 50g, the mass after it is filled with water is 150g, and the total mass after it is filled with a certain liquid is 130g. Calculate the density of the liquid
3. Lock.
The tracks were laid on sleepers.
The wheels are patterned.
Write down the physics of these phenomena.
4. In the place where the belt pulley is used to drive, the belt should be tightened. This is to increase the friction by () method
5. Hang two objects weighing 40n and 8N on both ends of the lever respectively. When the lever is balanced, the force arm ratio is ()

1. 8 F = (8900 / 1000) × 9.8 = 87.22 n, P = f / SF is the pressure, s is the contact area between two objects, P = 87.22 / (80 / 10000) = 10902.5 PA 2, the volume of the container is calculated first, the mass of the water is calculated: M water = m total - M container = 150 G-5

Two 40cm long iron wires, one is surrounded by a square, the other is surrounded by a 12cm long rectangle. What percentage of the square is the area of the rectangle?

A: the area of a rectangle is 96% of that of a square

Verification: the power of 2 + 3 is a composite number

The power of 2 is 2
The second power of 2 is 4
The third power of 2 is 8
The fourth power of 2 is 6
The fifth power of 2 is 2
.
.
If the number of single digits is regular, 2, 4, 8 and 6 are in circulation, then the mantissa of 2 to the power of 2013 should be: 2013 divided by 4 and 1, then it is 2,2 + 3 = 5, indicating that the number of single digits of 2 to the power of 2013 + 3 should be 5, then this number can be divided by 5, so it must be a composite number

Who has the math review questions and answers in Volume 1 of grade 6

In the first semester of 2007-2008, grade 6 mathematics final comprehensive exercise paper class: Name: student number: Score: 1. Fill in the blanks: (12 points) 1. Kilogram = () gram 40 points = () when the reciprocal of 2 and 2 is (), () and 0.75 are reciprocal each other

If the height of a cylinder is increased by 3 cm, its surface area will increase by 18.84 square cm. What is the volume of the original cylinder?

Perimeter of bottom surface: 18.84 △ 3 = 6.28cm
Radius: 6.28 ／ 2 ／ 3.14 = 1cm
Bottom area: 3.14 × 1 × 1 = 3.14 square centimeter
Original volume: 3.14 × 5 = 15.7 cm3

Einstein deduced that the speed of light can't be surpassed by formula, but isn't it a little contradictory in practice
People love idealization most. A rocket can be realized if its material is wear-resistant enough, its fuel is sufficient and all its components are ideal enough, because science and molecular materials science are progressing all the time

In the ideal model, the rocket can not exceed the speed of light, because the acceleration of the rocket depends on the force. When the speed is large enough, the greater the speed, the smaller the influence of the force on the speed. When the speed of light is extremely solved, even if the extremely large force works for an extremely long time, the increase of the speed is almost zero, just like opening a number with a root or a higher root, It will never reach the exact number 1

The weight of the object to be lifted by the crane is 2000 n. under the following circumstances, what is the pulling force of the steel rope of the crane on the object? ① The object is still in the air (2) the object rises at a constant speed of 2 m / s (3) the object rises at a constant speed of 4 m / s (4) the object descends at a constant speed of 0.5 m / s ．

(1) The object is static in the air, in a state of equilibrium, and the force is balanced, so the pulling force and gravity on the object are a pair of balanced forces, so f = g = 2000N; (2) (3) (4) the object rises or falls at a constant speed at different speeds; that is, the objects all move in a straight line at a constant speed, so they are in a state of equilibrium, and the force is balanced, so the pulling force and gravity are still a pair of balanced forces, so f = G =So the answer is (1) 2000N; (2) 2000N; (3) 2000N; (4) 2000N

Xiaohong, Xiaofang and Xiaoli take three of the nine cards written with 10, 20, 30, 40, 50, 60, 70, 80 and 90. The product of Xiaohong's three numbers is 48000, the sum of Xiaofang's three numbers is 150, and the product of Xiaoli's three numbers is 63000. Which three cards do they take?