Fibonacci series can only go to 1 level or level 2 at a time, so the total number of times to move to the tenth level is to move to the eighth level and move to the ninth level.

The movement times of the first floor are 1, the second floor is 2, the third floor is 1+2=3, and the fourth floor is 2+3=5, and so on.

1 2 3 5 8 13 2 1 34 55 89 .......

So there are 89 ways to walk on the tenth floor.

Mathematical practice:

Let the array An represent how many paths there are in step n, and the topic is to find A 10.

There are two ways to get to An, from n- 1 to 1 and from n-2 to 2, and then

Relationship: An = A(n- 1)+A(n-2) Fibonacci sequence.

Please go.

There is a formula that says:

Let the general term of Fibonacci sequence be one.

An = (p n-q n)/√ 5, where p = (√ 5- 1)/2 and q = (√ 5+ 1)/2.