How does the library code books?

How does the library code books?

The library codes books by using Chinese library code and bar code
1. Using Chinese Library Classification, we can give each kind of book a number, that is, the classification number. Then according to the actual situation of each library, we add the book number after the classification number, and form the call number together with the classification number, and stick the call number on the book
2. Stick the bar code on the title page of the book
3. Put the books with call number and bar code on the shelf in a certain order
4. Input the request number and bar code into the database system
5. The coding is completed. At this time, the book can be borrowed

How to code the books in the library?

Library to book coding is generally the use of Chinese library code plus bar code to book coding. 1, the use of Chinese library code, you can give each kind of book a number, that is, the classification number, and then each library according to their actual situation, in the classification number after the book number, and classification number together to form a call number, the call number pasted on the book

How are the books numbered in the library?

Library numbers books to facilitate management and search. Therefore, a systematic method is adopted to classify books. At present, 95% of large and medium-sized libraries in China use the Chinese Library Classification (CLC) to classify books

(13-x) divided by (21-x) = 8 divided by 13
How to solve this equation

(13-x)/(21-x)=8/13
Diagonal multiplication
8(21-x)=13(13-x)
168-8x=169-13x
13x-8x=169-168
5x=1
x=1/5
The fractional equation needs to be tested
By testing, x = 1 / 5 is the solution of the equation

The solution of inequality about X: m square * x + 1 ＞ x + m (M belongs to R)
Make the problem-solving process clear

The results show that: (m square - 1) x > M-1
Classification discussion:
When m = 1, the equation has no solution;
When m = - 1, the equation holds;
When - 1

Negative seven and three eighths * negative zero point five * negative two equals zero

Negative seven and three eighths * negative zero point five * negative two
=-7.3 / 8 × (0.5 × 2)
=-7.3/8 × 1
=-7 and 3 / 8

Solving bivariate linear equations -- X / 3 = Y / 4 = Z / 5 and 7x + 3Y - 5Z = 16
This is a set of equations{~

Let X / 3 = Y / 4 = Z / 5 = K
x=3k
y=4k
z=5k
Substituting 7x + 3Y - 5Z = 16
Find K
Substituting

1000 times 10000 equals

10000000

If the ratio of the three sides of a triangle is 2:3:4 and its circumference is 45cm, the lengths of the three sides of the triangle are

2+3+4=9
45/9=5,
So the three sides are:
2 * 5 = 10 cm,
3 * 5 = 15 cm,
4 * 5 = 20 cm

Three general formulas
(1) General term formula of sequence-1,2,5,8
（2）2,-1,-4,-7
(3) 3, root 10, root 11, root 2, root 3

-1+3*(n-1)
2-3*（n-1)
Radical (8 + n)