Addition and subtraction of primary and secondary roots.
When adding or subtracting secondary roots, you can first convert the secondary roots into the simplest secondary roots, and then merge the secondary roots with the same number of roots.
note:
The addition and subtraction of 1 and quadratic roots are often divided into two steps, the first step is simplification, and the second step is combination.
2. Before merging, it is important to clearly determine which quadratic roots have the same number of roots; When merging, it is similar to similar projects learned before, except for adding and subtracting factors other than the root sign, and the root index and root sign remain unchanged.
Multiplication and division of quadratic root.
Square root multiplication is equal to the arithmetic square root of square root product.
Quadratic radical division is equal to the arithmetic square root of the quotient of the square root.
The writing standard 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 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 n power of n is written on the left side of the symbol and n =.