What is the power rule of rational numbers?

What is the power rule of rational numbers?

When the number of negative factors is odd, the product is negative
When the number of negative factors is even, the product is positive
The first step is to determine the sign and then multiply the absolute value
In fact, these textbooks should have, students, you look carefully

The wall clock in Professor Li's laboratory rings several times every hour. This morning, when he began to do the experiment, the wall clock rings the time. When he finished the experiment, the wall clock rings the time again. From the beginning to the end of the experiment, the wall clock rings a total of 33 times. How many hours did Professor Zhang do the experiment?

Because 10 + 11 + 12 = 33, 12 - 10 = 2 (hours), a: Professor Zhang's experiment lasted 2 hours

Integral operation in the second semester of junior one
Square of 2004 - 2003 * 2005

2004^2-(2004-1)*(2004+1)
=2004^2-(2004^2-1^2)
=1