For integers: ab^2 can be used to find the root, which is equal to B times the root number A ... where A is the product of unequal prime numbers, for example, 6 is the product of prime number 2 and prime number 3. B is an integer, which can be positive or negative. For fractions: according to the formula that one-third of a under the root number is equal to the root number b and the root number a above, it can be transformed into integer roots. For decimals: turn decimals into fractions, and then be free.