How to get 100 for four 9

Most of the answers found on the Internet are: 99 + 9/9;

My ideas:

1): 9 + 9/9 = 10

2): 9 = 3 under the root number

3): The 3rd power of 10 = 1000

4): 1000 = 10 under the three root numbers

5): 10 square = 100

Solution

To facilitate the description:

Make a = (9 + 9/9) = 10

B = √ 9 = 3

C = B power of a = 1000

D = 3 times under the root number C = 10

E = square of D = 100

Then write a formula:

(The square of the cubic root number (B power of)

That is, the square of (the third root number (9 + 9/9) √ 9 to the power)

(I don't know if this character does not meet the requirements, because 2 must appear in the mathematical formula when the square is used)