For example:
12=2×2×3=2 ×3, √12 = √ (the square of 2) × √ 3 = 2 √ 3;
8=2×2×2=2 squared ×2, and √8=√(2 squared) ×√2=2√2.
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In the range of real numbers:
1, the root sign cannot be negative, and its operation result is not negative.
2. It can be negative under odd root sign.
Not limited to real numbers, that is, when considering imaginary numbers, even roots can be negative numbers, and i=√- 1 can be used.
Extended data:
Writing norms
The writing, printing and handwriting of the root sign are exactly the same. Only the writing norms of handwriting are introduced here.
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. (here, I only mainly introduce the order of strokes and writing methods. You can imitate writing according to this article, and it is not mandatory. )
2. Write down the number or formula of the prescription:
The number or algebraic expression of the root is 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.
3, write the root number or formula:
The power n of n is written on the left side of the symbol √ ~ When n=2 (square root), n can be ignored, but if it is a cubic root (cubic root), a quartic root, etc. , must write.
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