------
## 最终结论
```python
def larg_nnum(data, n):
    sorted_data = sorted(data, reverse=True)
    return sorted_data[:n]

# Test cases
assert larg_nnum([10, 20, 50, 70, 90, 20, 50, 40, 60, 80, 100],2)==[100,90]
assert larg_nnum([10, 20, 50, 70, 90, 20, 50, 40, 60, 80, 100],5)==[100,90,80,70,60]
assert larg_nnum([10, 20, 50, 70, 90, 20, 50, 40, 60, 80, 100],3)==[100,90,80]
```