Подстановка условия
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(m - n)*(sqrt(m) + sqrt(n)) при m = 1
/ ___ ___\
(m - n)*\\/ m + \/ n /
$$\left(\sqrt{m} + \sqrt{n}\right) \left(m - n\right)$$
/ ___ ___\
(m - n)*\\/ m + \/ n /
$$\left(\sqrt{m} + \sqrt{n}\right) \left(m - n\right)$$
$$m = 1$$
/ _____ ___\
((1) - n)*\\/ (1) + \/ n /
$$\left(\sqrt{(1)} + \sqrt{n}\right) \left((1) - n\right)$$
/ ___ ___\
(1 - n)*\\/ 1 + \/ n /
$$\left(- n + 1\right) \left(\sqrt{n} + \sqrt{1}\right)$$
/ ___\
\1 + \/ n /*(1 - n)
$$\left(- n + 1\right) \left(\sqrt{n} + 1\right)$$