To simplify the expression \(\sqrt{\frac{(0.0023 \times 750)}{(0.00345 \times 1.25)}}\), we can first evaluate the numerator and denominator separately:

Numerator: 0.0023 x 750 = 1.725

Denominator: 0.00345 x 1.25 = 0.0043125

Now, we can divide the numerator by the denominator:

\(\frac{1.725}{0.0043125}\) = 400

Finally, we can take the square root of this result:

\(\sqrt{400}\) = 20

So, the simplified form of the expression \(\sqrt{\frac{(0.0023 \times 750)}{(0.00345 \times 1.25)}}\) is 20.