There are 3600 TV sets in warehouse A and B. If 15 sets are taken from warehouse A and put into warehouse B, the number of TV sets in warehouse A and B is equal. How many TV sets are there in warehouse A and B?

There are 3600 TV sets in warehouse A and B. If 15 sets are taken from warehouse A and put into warehouse B, the number of TV sets in warehouse A and B is equal. How many TV sets are there in warehouse A and B?

A: there are 2250 TV sets in warehouse A and 1350 TV sets in warehouse B

The solution of 7x / 3 = 8.19

7x=3×8.19
x=24.57/7
x=3.51

Make an equation and solve it
In ancient times, there were two shepherd boys, a and B. A said to B, "give me one of your sheep, and the number of my sheep is twice the number of your sheep." B replied, "it's better to give me one of your sheep, so that the number of my sheep will be as much as you." how many sheep do shepherd boys a and B have

Let a be x and B be y
(X+1)/2=Y-1
X-I=Y+1
X=7
Y=5

If Sn = 48, s2n = 60, then s3n=______ ．

∵ sequence {an} is an equal ratio sequence, and its first n terms and Sn, s2n Sn, s3n-s2n also form an equal ratio sequence. ∵ (60-48) 2 = 48 × (s3n-60), the solution is s3n = 63, so the answer is 63

There are some books. If you give them to girls, you can get 15 books. If you give them to boys, you can get 10 books. If you give them to the whole class, how many books can you get?
There are several tons of grain in the two warehouses of Party A and Party B. from Party A to Party B, Party A moves another quarter to Party A. what is the percentage that Party A has?

1. The number of boys and girls is 3:2, so each of them can only be divided into 10 / (5 / 3) = 6
2. I can't understand the second question

The cross section of the reservoir dam is trapezoidal, the width of the dam crest ad is 6m, the height of the dam is 17m, the slope of the slope AB is I1 = 1: root 3, and the slope of the slope CD is I2 = 1:3. Calculate the length of the slope AB, the degree of the dam bottom replacement BC and the slope ∠ B

The slope of slope AB I = 1: root 3, so the angle a = 30 degrees, ab = 46
The slope of hypotenuse CD is I = 1:1 and the angle is d = 45 degrees
Ad = 6 + 23 + 23 (radical 3) = 29 + 23 (radical 3)

A math problem, grade four
Ding Ding's father has set a power on password for Ding Ding's computer, which is composed of seven digits of 0, 1, 2, 3, 4, 5, 6 and 9. An approximate number is about 3.5 million, and the maximum number is seven digits. What is the power on password?

The approximate number is about 3.5 million,
That is, accurate to 10000 bits
three million five hundred and four thousand nine hundred and sixty-two

On determinants of invertible matrices
If the matrix A is NxN invertible, is there any determinant of a not equal to zero?

If a is an invertible matrix, then
A*A-1=E
The determinants on both sides are
|A*A-1|=|E|=1
On the left is | a * A-1 | = | a | * | A-1 | = 1 ≠ 0, so | a | ≠ 0
The proof is complete

Put 1,2,3,4,5,6,7,8,9 in the box of the following formula (each number should be used) to make the equation hold
（）（）（）×（）（）＝（）（）×（）＝5568

32*174=58*96
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Let a be a matrix of order n, and the rank of a is n-1, m and N are two different solutions, then the general solution of AX = 0 is,
Let a be a matrix of order n, and the rank of a is n-1, m and N are two different solutions, then the general solution of AX = 0 is,

R is n-1, which means that the solution is N-N + 1 = 1
The general solution of AX = 0 can be expressed as km or kn