Find the largest possible value in the real numbers of the term $$\frac{3x^2 + 16xy + 15y^2}{x^2 + y^2}$$ with $x^2 + y^2 \ne 0$.
1. We start with the given expression:
   \[
   \frac{3x^2 + 16xy + 15y^2}{x^2 + y^2}
   \]
   and we need to find its maximum value for \(x^2 + y^2 \neq 0\).

2. Let \(g(x, y) = x^2 + y^2 = c\). This allows us to rewrite the function as:
   \[
   f(x, y) = \frac{3x^2 + 16xy + 15y^2}{x^2 + y^2} = \frac{3c + 16xy + 12y^2}{c} = 3 + \frac{16xy + 12y^2}{c}
   \]

3. To maximize \(f(x, y)\) subject to \(g(x, y) = c\), we use the method of Lagrange multipliers. We set:
   \[
   \nabla f = \lambda \nabla g
   \]
   where \(\nabla f = \left\langle \frac{\partial f}{\partial x}, \frac{\partial f}{\partial y} \right\rangle\) and \(\nabla g = \left\langle 2x, 2y \right\rangle\).

4. Calculating the partial derivatives of \(f(x, y)\):
   \[
   \frac{\partial f}{\partial x} = \frac{16y}{c}, \quad \frac{\partial f}{\partial y} = \frac{16x + 24y}{c}
   \]
   Thus, we have:
   \[
   \left\langle \frac{16y}{c}, \frac{16x + 24y}{c} \right\rangle = \lambda \left\langle 2x, 2y \right\rangle
   \]

5. Equating the components, we get:
   \[
   \frac{16y}{c} = \lambda \cdot 2x \quad \text{and} \quad \frac{16x + 24y}{c} = \lambda \cdot 2y
   \]

6. From the first equation:
   \[
   8y = \lambda c x
   \]
   From the second equation:
   \[
   8x + 12y = \lambda c y
   \]

7. Solving for \(\lambda\):
   \[
   8x = (\lambda c - 12)y
   \]
   Substituting \(y = \frac{\lambda c x}{8}\) into the second equation:
   \[
   8x = (\lambda c - 12) \frac{\lambda c x}{8}
   \]
   Simplifying:
   \[
   64 = (\lambda c)(\lambda c - 12)
   \]
   This gives us the quadratic equation:
   \[
   (\lambda c)^2 - 12(\lambda c) - 64 = 0
   \]

8. Solving the quadratic equation:
   \[
   (\lambda c) = \frac{12 \pm \sqrt{144 + 256}}{2} = \frac{12 \pm 20}{2}
   \]
   Thus, \(\lambda c = 16\) or \(\lambda c = -4\).

9. If \(\lambda c = 16\):
   \[
   8y = 16x \implies y = 2x
   \]
   Substituting \(y = 2x\) into \(x^2 + y^2 = c\):
   \[
   x^2 + 4x^2 = c \implies x = \pm \sqrt{\frac{c}{5}}, \quad y = \pm 2\sqrt{\frac{c}{5}}
   \]
   Substituting these into \(f(x, y)\):
   \[
   f(x, y) = 3 + \frac{16 \cdot 2c/5 + 12 \cdot 4c/5}{c} = 3 + \frac{32c/5 + 48c/5}{c} = 3 + \frac{80c/5}{c} = 3 + 16 = 19
   \]

10. If \(\lambda c = -4\):
    \[
    8y = -4x \implies x = -2y
    \]
    Substituting \(x = -2y\) into \(x^2 + y^2 = c\):
    \[
    4y^2 + y^2 = c \implies y = \pm \sqrt{\frac{c}{5}}, \quad x = \mp 2\sqrt{\frac{c}{5}}
    \]
    Substituting these into \(f(x, y)\):
    \[
    f(x, y) = 3 + \frac{-16 \cdot 2c/5 + 12c/5}{c} = 3 + \frac{-32c/5 + 12c/5}{c} = 3 + \frac{-20c/5}{c} = 3 - 4 = -1
    \]

11. Therefore, the maximum value of the given expression is:
    \[
    \boxed{19}
    \]