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[latex]f(x)=1-\frac{3}{2x}=\frac{2x-3}{2x}\\\\\\\boxed{\\\\f(\frac{1}{2})=\frac{2.\frac{1}{2}-3}{2.\frac{1}{2}}=-2}\\\\\\\\\boxed{f(5)=\frac{2.5-3}{2.5}=\frac{10-3}{10}=\frac{7}{10}=0,7}[/latex]
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[latex]f(x)=1-\frac{3}{2x}=\frac{2x-3}{2x}\\\\\\\boxed{\\\\f(\frac{1}{2})=\frac{2.\frac{1}{2}-3}{2.\frac{1}{2}}=-2}\\\\\\\\\boxed{f(5)=\frac{2.5-3}{2.5}=\frac{10-3}{10}=\frac{7}{10}=0,7}[/latex]