Tính nhanh
----- Nội dung ảnh -----
d) \( D = \left(1 - \frac{1}{1 + 2}\right)\left(1 - \frac{1}{1 + 2 + 3}\right)\left(1 - \frac{1}{1 + 2 + 3 + 4}\right) \ldots \left(1 - \frac{1}{1 + 2 + \ldots + 2024}\right)\left(1 - \frac{1}{1 + 2 + \ldots + 2025}\right) \)
