To simplify the expression (m - 2√(mn) + n) / (m - n), we can first simplify the numerator:

m - 2√(mn) + n = √m^2 - 2√mn + √n^2
= (√m - √n)^2
= (m - 2√mn + n)

Now, we can rewrite the original expression as:

(m - 2√(mn) + n) / (m - n) = [(√m - √n)^2] / (m - n)
= [(√m - √n)(√m - √n)] / (m - n)
= (√m - √n)(√m - √n) / (m - n)
= (√m - √n)^2 / (m - n)
= (m - 2√mn + n) / (m - n)

Therefore, the simplified expression is (m - 2√mn + n) / (m - n).