2 1.6÷60=0.36(m？ )

Therefore, the side length of each square floor tile is:

0.36 = 0.6m.

10, solution: It is known that the two square roots of a positive number are 2a-2 and a-4, and the two square roots of a positive number are opposite.

So: 2a-2= -(a-4)

2a-2=4-a

3a=6

a=2