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請解這個題目，並且列出詳細步驟及解釋。

To solve the problem of determining the total number of stickers used to form a 10-layer Christmas tree, we can break it down step by step. Let's interpret the problem and calculate accordingly.

### Step-by-Step Solution:

1. **Understanding the Structure:**
   - The Christmas tree has 10 layers.
   - Each layer consists of 3 rows.
   - The number of stickers in each row increases as we move from one layer to the next.
   - For each layer:
     - The first row has \(a\) stickers.
     - The second row has \(a + 2\) stickers.
     - The third row has \(a + 4\) stickers.

2. **Observing the Pattern:**
   - From the given image, we see that:
     - The first row of the first layer has 1 sticker.
     - The first row of the second layer has 3 stickers (increased by 2).
     - The first row of the third layer has 5 stickers (increased by 2).
   - Therefore, the first row of the \(n\)-th layer has \(2n - 1\) stickers.

3. **Calculating Stickers for Each Layer:**
   - For the \(n\)-th layer:
     - First row: \(2n - 1\) stickers.
     - Second row: \(2n - 1 + 2 = 2n + 1\) stickers.
     - Third row: \(2n - 1 + 4 = 2n + 3\) stickers.
   - Total stickers for the \(n\)-th layer:
     \[
     (2n - 1) + (2n + 1) + (2n + 3) = 6n + 3
     \]

4. **Summing Up the Total Stickers for 10 Layers:**
   - We need to sum \(6n + 3\) for \(n\) from 1 to 10:
     \[
     \sum_{n=1}^{10} (6n + 3)
     \]
   - This can be broken down into two separate sums:
     \[
     6 \sum_{n=1}^{10} n + \sum_{n=1}^{10} 3
     \]

5. **Calculating Each Sum:**
   - Sum of the first 10 natural numbers:
     \[
     \sum_{n=1}^{10} n = \frac{10 \cdot 11}{2} = 55
     \]
   - Sum of the constant term:
     \[
     \sum_{n=1}^{10} 3 = 3 \times 10 = 30
     \]

6. **Combining the Results:**
   - Combining the two sums:
     \[
     6 \times 55 + 30 = 330 + 30 = 360
     \]

### Conclusion:

The total number of stickers used to form the 10-layer Christmas tree is **360**.

So, the correct answer is:
\[
\boxed{360}
\]

Would you like further details or have any questions? 

Here are 5 numbered questions for you to ask:
1. How do we derive the sum of the first \(n\) natural numbers?
2. Can you explain another example of a similar pattern?
3. What are other methods to verify the solution?
4. How can we generalize this problem for any number of layers?
5. What other real-life applications involve similar pattern recognition?

**Tip:** When solving pattern problems, always try to break down the structure and look for repeating sequences or relationships.

Learn how to calculate the total number of stickers used to form a 10-layer Christmas tree with a detailed step-by-step solution. This problem involves pattern recognition and the arithmetic series formula. Suitable for students in Grades 7-9.

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