Define the sequences $a_{0}, a_{1}, a_{2}, ...$ and $b_{0}, b_{1}, b_{2}, ...$ by $a_{0}= 2, b_{0}= 1, a_{n+1}= 2a_{n}b_{n}/(a_{n}+b_{n}), b_{n+1}= \sqrt{a_{n+1}b_{n}}$. Show that the two sequences converge to the same limit, and find the limit.
1. Define the sequences \(a_n\) and \(b_n\) as given:
   \[
   a_0 = 2, \quad b_0 = 1
   \]
   \[
   a_{n+1} = \frac{2a_n b_n}{a_n + b_n}, \quad b_{n+1} = \sqrt{a_{n+1} b_n}
   \]

2. Define the ratio sequence \(c_n = \frac{b_n}{a_n}\). Initially, we have:
   \[
   c_0 = \frac{b_0}{a_0} = \frac{1}{2}
   \]

3. Express \(a_{n+1}\) and \(b_{n+1}\) in terms of \(c_n\):
   \[
   a_{n+1} = \frac{2a_n b_n}{a_n + b_n} = \frac{2a_n \cdot c_n a_n}{a_n + c_n a_n} = \frac{2a_n^2 c_n}{a_n(1 + c_n)} = \frac{2a_n c_n}{1 + c_n}
   \]
   \[
   b_{n+1} = \sqrt{a_{n+1} b_n} = \sqrt{\left(\frac{2a_n c_n}{1 + c_n}\right) b_n} = \sqrt{\frac{2a_n c_n \cdot c_n a_n}{1 + c_n}} = \sqrt{\frac{2a_n^2 c_n^2}{1 + c_n}} = a_n \sqrt{\frac{2c_n^2}{1 + c_n}}
   \]

4. Now, compute \(c_{n+1}\):
   \[
   c_{n+1} = \frac{b_{n+1}}{a_{n+1}} = \frac{a_n \sqrt{\frac{2c_n^2}{1 + c_n}}}{\frac{2a_n c_n}{1 + c_n}} = \frac{\sqrt{\frac{2c_n^2}{1 + c_n}}}{\frac{2c_n}{1 + c_n}} = \frac{\sqrt{2c_n^2}}{2c_n} \cdot \sqrt{1 + c_n} = \sqrt{\frac{1 + c_n}{2}}
   \]

5. We now have the recursive relation for \(c_n\):
   \[
   c_{n+1} = \sqrt{\frac{1 + c_n}{2}}
   \]

6. To find the limit of \(c_n\), let \(L\) be the limit of \(c_n\) as \(n \to \infty\). Then:
   \[
   L = \sqrt{\frac{1 + L}{2}}
   \]

7. Square both sides to solve for \(L\):
   \[
   L^2 = \frac{1 + L}{2}
   \]
   \[
   2L^2 = 1 + L
   \]
   \[
   2L^2 - L - 1 = 0
   \]

8. Solve the quadratic equation:
   \[
   L = \frac{-(-1) \pm \sqrt{(-1)^2 - 4 \cdot 2 \cdot (-1)}}{2 \cdot 2} = \frac{1 \pm \sqrt{1 + 8}}{4} = \frac{1 \pm 3}{4}
   \]
   \[
   L = \frac{4}{4} = 1 \quad \text{or} \quad L = \frac{-2}{4} = -\frac{1}{2}
   \]

9. Since \(c_n = \frac{b_n}{a_n}\) and both \(a_n\) and \(b_n\) are positive, \(c_n\) must be positive. Therefore, the limit \(L\) must be \(1\).

10. Since \(c_n \to 1\), we have:
    \[
    \frac{b_n}{a_n} \to 1 \implies b_n \to a_n
    \]

11. Let \(a_n \to L\) and \(b_n \to L\). Then:
    \[
    a_{n+1} = \frac{2a_n b_n}{a_n + b_n} \to \frac{2L \cdot L}{L + L} = \frac{2L^2}{2L} = L
    \]
    \[
    b_{n+1} = \sqrt{a_{n+1} b_n} \to \sqrt{L \cdot L} = L
    \]

Thus, both sequences \(a_n\) and \(b_n\) converge to the same limit \(L\).

The final answer is \(\boxed{1}\).