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Sombrea exactamente dos de los nueve cuadrados más pequeños de modo que la figura resultante tenga
Solo una línea de simetría vertical y una horizontal.

To solve this problem, we need to shade exactly two of the nine smaller squares in such a way that the resulting figure has **only** one vertical line of symmetry and one horizontal line of symmetry.

### Step-by-Step Approach:

1. **Visualizing Symmetry**:
   - A vertical line of symmetry means that the left side of the figure mirrors the right side.
   - A horizontal line of symmetry means that the top part of the figure mirrors the bottom part.

2. **Choosing the Squares**:
   - To ensure only one vertical and one horizontal line of symmetry, the shaded squares should be symmetrically placed relative to both axes.
   - The center square of the grid is crucial because it’s the intersection of both axes. To maintain one symmetry for each axis, the center square must remain unshaded.

3. **Shading Strategy**:
   - Select squares that are equidistant from both the center and the axes of symmetry.
   - For example, shading the top-left square and the bottom-right square would create two lines of symmetry, which isn't what we want.
   - Instead, shading two squares that are symmetrical with respect to only one axis at a time but not both at once is required.

### Result:
- Shade the middle square of the first row and the middle square of the third row.
- This ensures that the shaded squares align with both a vertical and a horizontal axis of symmetry, creating a figure with only one line of symmetry in each direction.

Would you like me to provide additional details or generate an image showing the correct shading?

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Here are 5 related questions for further exploration:

1. How many different ways can you shade exactly two squares to achieve two lines of symmetry?
2. What are the possible configurations for achieving only one vertical line of symmetry without a horizontal one?
3. If three squares were to be shaded, how could you arrange them to maintain exactly one line of symmetry?
4. How does the concept of rotational symmetry differ from line symmetry in this context?
5. Can you create a figure with no lines of symmetry by shading two squares?

**Tip**: When solving symmetry problems, always consider the position of the center of the figure, as it often plays a key role in maintaining or breaking symmetry.

Learn how to solve the problem of achieving exactly one vertical and one horizontal line of symmetry by shading exactly two squares in a grid of nine. This problem involves understanding symmetry concepts in geometry and requires strategic placement of shaded squares. Suitable for students in Grades 6-8.

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