------
## 最终结论
```python
def check_type(t):
    types = {type(x) for x in t}
    return len(types) == 1

# Test cases
assert check_type((5, 6, 7, 3, 5, 6)) == True
assert check_type((1, 2, "4")) == False
assert check_type((3, 2, 1, 4, 5)) == True
```