The random variable is the square of the maximum minus the cube of the minimum. You roll three colored dice:
$$\text{Unknown environment 'tabular'}$$

Give the random variable.
$$\text{ r.v. }=$$

Step 1 ：The random variable is defined as the square of the maximum value rolled minus the cube of the minimum value rolled.

Step 2 ：In this case, we have three dice rolls with values 2, 5, and 1.

Step 3 ：The maximum value rolled is 5 and the minimum value rolled is 1.

Step 4 ：Therefore, the random variable can be calculated as the square of 5 minus the cube of 1.

Step 5 ：Calculate the square of the maximum value: $5^2=25$

Step 6 ：Calculate the cube of the minimum value: $1^3=1$

Step 7 ：Subtract the cube of the minimum value from the square of the maximum value: $25-1=24$

Step 8 ：Final Answer: The random variable is $\boxed{{\displaystyle 24}}$