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Question Number 164982 by alephzero last updated on 24/Jan/22
Prove, that (a/b) : (c/d) = (a/b) ∙ (d/c)
$$\mathrm{Prove},\:\mathrm{that}\:\frac{{a}}{{b}}\::\:\frac{{c}}{{d}}\:=\:\frac{{a}}{{b}}\:\centerdot\:\frac{{d}}{{c}} \\ $$

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