Determine all pairs of [i]distinct[/i] real numbers $(x, y)$ such that both of the following are true:

[list]
[*]$x^{100} - y^{100} = 2^{99} (x-y)$
[*]$x^{200} - y^{200} = 2^{199} (x-y)$
[/list]
1. Given the equations:
   \[
   x^{100} - y^{100} = 2^{99} (x-y)
   \]
   \[
   x^{200} - y^{200} = 2^{199} (x-y)
   \]

2. Let's denote \( x - y = d \). Since \( x \) and \( y \) are distinct, \( d \neq 0 \).

3. From the first equation, we can rewrite it as:
   \[
   x^{100} - y^{100} = 2^{99} d
   \]

4. From the second equation, we can rewrite it as:
   \[
   x^{200} - y^{200} = 2^{199} d
   \]

5. Notice that \( x^{200} - y^{200} = (x^{100} - y^{100})(x^{100} + y^{100}) \). Using the first equation, we substitute \( x^{100} - y^{100} \):
   \[
   x^{200} - y^{200} = (2^{99} d)(x^{100} + y^{100})
   \]

6. Equate this to the second equation:
   \[
   (2^{99} d)(x^{100} + y^{100}) = 2^{199} d
   \]

7. Since \( d \neq 0 \), we can divide both sides by \( d \):
   \[
   2^{99} (x^{100} + y^{100}) = 2^{199}
   \]

8. Divide both sides by \( 2^{99} \):
   \[
   x^{100} + y^{100} = 2^{100}
   \]

9. Now we have two equations:
   \[
   x^{100} - y^{100} = 2^{99} d
   \]
   \[
   x^{100} + y^{100} = 2^{100}
   \]

10. Add these two equations:
    \[
    (x^{100} - y^{100}) + (x^{100} + y^{100}) = 2^{99} d + 2^{100}
    \]
    \[
    2x^{100} = 2^{99} d + 2^{100}
    \]

11. Divide both sides by 2:
    \[
    x^{100} = 2^{98} d + 2^{99}
    \]

12. Subtract the first equation from the second:
    \[
    (x^{100} + y^{100}) - (x^{100} - y^{100}) = 2^{100} - 2^{99} d
    \]
    \[
    2y^{100} = 2^{100} - 2^{99} d
    \]

13. Divide both sides by 2:
    \[
    y^{100} = 2^{99} - 2^{98} d
    \]

14. We now have:
    \[
    x^{100} = 2^{98} d + 2^{99}
    \]
    \[
    y^{100} = 2^{99} - 2^{98} d
    \]

15. Since \( x \) and \( y \) are distinct, we need to ensure that \( x \neq y \). Therefore, we need to check if there are any values of \( d \) that satisfy this condition.

16. If we assume \( x = 2 \) and \( y = 0 \), we get:
    \[
    x^{100} = 2^{100}
    \]
    \[
    y^{100} = 0
    \]

17. Substituting these values into the original equations:
    \[
    2^{100} - 0 = 2^{99} \cdot 2
    \]
    \[
    2^{200} - 0 = 2^{199} \cdot 2
    \]

18. Both equations hold true, so \( (2, 0) \) is a solution.

19. Similarly, if we assume \( x = 0 \) and \( y = 2 \), we get:
    \[
    x^{100} = 0
    \]
    \[
    y^{100} = 2^{100}
    \]

20. Substituting these values into the original equations:
    \[
    0 - 2^{100} = 2^{99} \cdot (-2)
    \]
    \[
    0 - 2^{200} = 2^{199} \cdot (-2)
    \]

21. Both equations hold true, so \( (0, 2) \) is a solution.

The final answer is \(\boxed{(2, 0) \text{ and } (0, 2)}\).