$\left[\begin{array}{ll}{\left[\begin{array}{l}\text { Common fractions } \\ \text { [Examples and counterexamples. Constructions ] }\end{array}\right]}\end{array}\right]$

Author: Akonn E, Kaminin D.

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