The difference between the power without brackets and the power with brackets, such as the difference between the second power of - 2 / 5 and the second power of (- 2 / 5), just tell me how to calculate the first one

The difference between the power without brackets and the power with brackets, such as the difference between the second power of - 2 / 5 and the second power of (- 2 / 5), just tell me how to calculate the first one

-(2/5)^2=-4/25
(-2/5)^2=4/25
-2^2/5=-4/5
The first one didn't figure out where your power was added. I didn't know whether it was added to the fraction, the numerator or the denominator?
If it's added to the fraction, it's the first one. If it's added to the numerator, it's the third one. If it's added to the denominator, it's impossible,