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The problem you're referring to from the image is written in Japanese, but I can translate and help you solve it. Let's break down the two visible problems.

### Problem 4:
This problem asks to find the equation of a plane that is equidistant from three points:  
\( A(1, 2, 1) \), \( B(-1, 0, 1) \), and the origin \( O(0, 0, 0) \).

#### Solution Strategy:
To find the plane that is equidistant from these three points, we can set up the equation of the plane as:

\[
ax + by + cz = d
\]

For the plane to be equidistant from the three points, the perpendicular distances from each of the three points to the plane must be equal. We can use the formula for the perpendicular distance from a point \( (x_1, y_1, z_1) \) to a plane \( ax + by + cz + d = 0 \):

\[
\text{Distance} = \frac{|ax_1 + by_1 + cz_1 + d|}{\sqrt{a^2 + b^2 + c^2}}
\]

We'll substitute the coordinates of points \( O(0,0,0) \), \( A(1, 2, 1) \), and \( B(-1, 0, 1) \) into this formula and solve for the coefficients \( a \), \( b \), and \( c \).

### Problem 5:
This problem involves finding the coordinates of a point \( P \) on the line segment between two points \( A(4, 0, 5) \) and \( B(0, 2, 1) \), such that the sum of distances from \( P \) to \( O \) and from \( P \) to \( AB \) is minimized.

#### Solution Strategy:
1. **Find the parametric equation of line AB**:  
   The equation of the line segment joining two points \( A(x_1, y_1, z_1) \) and \( B(x_2, y_2, z_2) \) can be given as:

   \[
   P(t) = (1-t)A + tB = (1-t)(4, 0, 5) + t(0, 2, 1)
   \]

   This will give the parametric coordinates of the point \( P(t) \).

2. **Minimize the distance function**:  
   We need to minimize the total distance function, which is the sum of the distance from \( P \) to the origin and from \( P \) to the line AB. This can be expressed mathematically and minimized using calculus techniques (finding the derivative and setting it to zero to locate the minimum).

Would you like more details on these steps? Let me know if you'd like to go deeper into solving them.

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**Follow-up questions:**
1. What is the perpendicular distance formula used for finding distances between points and planes?
2. How do you find the equation of a plane given three points in space?
3. What is the parametric equation of a line segment between two points in 3D space?
4. How do you use calculus to minimize a function of distances?
5. What role does symmetry play in minimizing distances in geometry?

**Tip:** When dealing with 3D geometry problems, visualize the problem by sketching or mentally picturing the points, lines, and planes to better understand their spatial relationships.

Find the plane equidistant from three points A(1, 2, 1), B(-1, 0, 1), and O(0, 0, 0), and find the point P on the line segment between A(4, 0, 5) and B(0, 2, 1) such that the sum of distances from P to O and AB is minimized.

Solve a 3D geometry problem involving finding the equation of a plane equidistant from three points and minimizing the distance from a point on a line segment. This problem covers concepts such as the parametric equation of a line and the perpendicular distance formula. Suitable for high school students.

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