1、√ 1= 1

2、√2= 1.4 14

3、√3= 1.732

4、√4=2

5、√5=2.236

6、√6=2.449

7、√7=2.646

8、√8=2.828

9、√9=3

10、√ 10=3. 162

1 1、√ 1 1=3.3 17

12、√ 12=3.464

13、√ 13=3.606

14、√ 14=3.742

15、√ 15=3.873

16、√ 16=4

17、√ 17=4. 123

18、√ 18=4.243

19、√ 19=4.359

20、√20=4.472?

Extended data:

The writing of the root number

1, write the root number:

Draw a short diagonal line in the upper right corner of the middle of the grid, and then draw a middle diagonal line to the lower right continuously. For the same stroke, draw a long diagonal line to the upper right continuously, and then draw a horizontal line with moderate length near the top of the grid according to your own needs, which is not enough.

2. Write down the number or formula of the prescription:

The number of roots or algebraic expressions are written in the area surrounded by the right side of the V-shaped part on the left side of the symbol and the lower part of a horizontal part above the symbol, and cannot be out of bounds. If the number of roots or algebraic expression is too long, the upper horizontal part must be extended to ensure the coverage of the root number or algebraic expression below.