3+ [ Examples and counterexamples. Constructions]

Authors: Akoyan E., Kalinin D....

Can the asterisks in the equality $\frac{*}{*}+\frac{*}{*}+\frac{*}{*}+\frac{*}{*}=$* be replaced with the digits from 1 to 9, each used once, so that the equality becomes true?

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From the possible examples, let's give two: $7 / 4+6 / 8+5 / 1+3 / 2=9$, $5 / 4+6 / 8+9 / 3+2 / 1=7$.

## Answer

It can be done.