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(2,5)^-1 = (5/2)^-1 = 2/5 = 0,4

[latex] (2,5)^{-1} [/latex] = [latex](2 \frac{1}{2}) ^{-1} [/latex] = [latex] (\frac{5}{2})^{-1} [/latex] = [latex] \frac{2}{5} [/latex] = [latex]0,4[/latex]