Addition and subtraction: combination of similar items, combination of similar quadratic roots, and simplification of quadratic roots before combination.

Such as root number 12- root number 3+ root number 2=2 root number 3- root number 3+ root number 2=(2- 1) root number 3+ root number 2= root number 3+ root number 2.

Multiplication and division operation: there are formulas in the textbook, just remember the multiplication and division outside the root number and inside and inside the root number.

For example, the square root of root number 24 12÷3 6 =(24÷3) root number (12÷6)=8 root number 2.

The square root of 3 6×4 radical 2=(3×4) radical (6×4)= 12 radical 24 = 12×2 6 square root = 24 6 square root.

Power operation, junior high school only requires secondary operation with secondary roots. There are two formulas in the textbook. Write them down yourself.