Please explain the formula, 1. The rabbit has three chickens. How many chickens are there? 2. There are three little rabbits and two more chickens than Xiaomian. How many chickens are there? 3. The rabbit has three chickens. How many chickens are there? 4. The little rabbit has three chickens, which are the two companions of the little rabbit. How many chickens are there? The relationship between one company and two companies

How many chickens are there? Take the number of rabbits as one time, the number of chickens is 1 + 1 = 2 times, the number of chickens is 3 × 2 = 6. 2. Take the number of rabbits as one time, the number of chickens is 1 + 2 = 3 times, the number of chickens is 3 × 3 = 9

2 / 3 2 / 15 2 / 9 2 / 7 2 / 5 (size sort)
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7.08 L = () cubic decimeter
When doing the calculation problem, little careless added two numbers together by mistake and got 17.2, 15.6 less than the correct answer. What are the two addends? What is the correct answer?
A two digit number can be divided by 2, and the sum of the two digits is 8. What are the two digits?

2 / 15 ″ 2 / 9 ″ 2 / 7 ″ 2 / 5 ″ 2 / 3
7.08 liter = (7.08) cubic decimeter (1 liter = 1 cubic decimeter)
17.2+15.6=32.8
(32.8-17.2) △ 2 = 15.6 △ 2 = 7.8 -- an addend
7.8 + 17.2 = 25 -- another addend
(according to 17.2, the difference between the two numbers is 17.2, and the sum of the two numbers is 32.8. Subtract one number more than the other, and then average it. The smaller number will be calculated, and the larger number will be calculated by adding the difference between the two numbers.)
62, 26, 44 and 80 are the only ones (according to "divisible by 2", we can see that this two digit number must be even. Think again, the two numbers with sum 8 are 6 + 2, 2 + 6, 8 + 0 and 4 + 4)
The greatest common divisor refers to the largest of the factors shared by several integers. The least common multiple refers to the smallest of the factors shared by several integers. The odd number refers to the number that cannot be divided by two
Hope to help you!

There should be practical problems, calculation problems, graphic problems, equations There should be all types in mathematics books
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A workshop can produce 120 class a parts, or 100 class B parts, or 200 class C parts every day. Three, two, and one parts of class A, B, and C can be made into a set. Now it is required to produce the most complete sets of products within 30 days. How many days should the three parts of class A, B, and C be produced

-Is 2 / 3 a fraction? - is 0.75 a decimal? What does 5 in 5 / 7 mean?

Yes; yes; 5 means five out of seven

- 0.00024 by scientific counting method

-2.4*10^-4

The writing background of one night's work
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As shown in the figure, take vertex a of rectangle ABCD as the origin, the line where ad is located is the x-axis, and the line where AB is located is the y-axis to establish a straight plane

As shown in Figure 1, take the vertex a of rectangle ABCD as the origin, the line where ad is located as the x-axis, and the line where AB is located as the y-axis, and establish the plane rectangular coordinate system. The coordinates of point D are (8,0), and the coordinates of point B are (0,6). Point F moves on the diagonal AC (point F does not coincide with points a and C). Through point F, it makes the vertical lines of x-axis and y-axis respectively, and the vertical feet are g, e

Math problem of junior high school: write 1, 2, 3 to 100 numbers on the blackboard. Now erase any two numbers, and then write the sum of the two numbers minus one. Please

1+2+3+… +100=（1+100）×100÷2=5050
When the last number is left, 99 numbers are reduced, that is to say, 99 operations are performed, and the total is reduced by 99;
The sum at this point is:
5050-99=4951,
So the last remaining number is 4951
So the answer is: 4951

Dissolve 20.00 g of the mixture of NaCl and NaBr in proper amount of water, add enough chlorine, after sufficient reaction, evaporate, cool and weigh the solution to obtain 15.55 g of solid matter?

It's actually the beginning of NaCl and NaBr
It turns out to be NaCl
BR is replaced by CL
The mass reduction of solid is 20-15.55 = 4.45g
Substitute according to 1:1
Br----Cl----△
80 35.5 44.5
x 4.45g
The solution is x = 8g
So the mass fraction of BR is 8 / 20 = 40%

The base of a triangle and a parallelogram are equal, so are their areas. The height of a parallelogram is 3cm. What is the height of a triangle

The height of a triangle with equal base and equal area is twice that of a parallelogram
3 × 2 = 6 (CM)

There should be practical problems, calculation problems, graphic problems, equations There should be all types in mathematics books Don't buy books