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Algebra
Level
3
\[ \dfrac a{b+c+d} + \dfrac b{a+c+d} + \dfrac c{a+b+d} + \dfrac d{a+b+c} \]
If \(a,b,c\) and \(d\) are positive real numbers, find the minimum value of the expression above.
Give your answer to 2 decimal places.
by
Kristian Vasilev