Question

(n
$( {n}^{ - 1} - {m}^{ - 1} ) \times (m - n) {}^{ - 1} = (mn) {}^{ - 1}$
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Answer 1

Step-by-step explanation:

a^-1 = 1/a

= (n^-1 -m^-1)(m-n)^-1

1 1 1 m-n 1

=__ - __ × ___ = _______ = ___ = (mn)^-1

n m (m-n) mn ×(m-n) mn