再看看DS 的英文回答。以前已經貼出中文的,就不貼了。

To compare the numerical values **3.11** and **3.9**, follow these steps:

1. **Compare the Integer Parts**:
   - Both numbers have the same integer part, which is **3**.

2. **Compare the Decimal Parts**:
   - The decimal part of **3.11** is **0.11**.
   - The decimal part of **3.9** is **0.90** (since **3.9 = 3.90**).
   - Clearly, **0.90 > 0.11**, so **3.9 > 3.11**.

**Final Answer**:
\boxed{3.9\ \text{is greater}}

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