Suppose that a computer that originally sold for $x$ dollars has been discounted $39 \%$. Which one of the following expressions does not represent its sale price?

Step 1 ：Suppose that a computer that originally sold for \(x\) dollars has been discounted 39\%. We need to find which one of the following expressions does not represent its sale price.

Step 2 ：The sale price of the computer would be the original price minus the discount. The discount is 39% of the original price. So, the sale price would be represented by the expression \(x - 0.39x\) or \(0.61x\). Any expression that does not simplify to this would not represent the sale price.

Step 3 ：Let's check the given expressions: \('x - 0.39*x'\), \('0.61*x'\), \('x - 0.61*x'\), \('0.39*x'\).

Step 4 ：From the results, we can see that the expressions \('x - 0.39*x'\) and \('0.61*x'\) correctly represent the sale price, while \('x - 0.61*x'\) and \('0.39*x'\) do not.

Step 5 ：Final Answer: The expressions that do not represent the sale price of the computer are \(\boxed{'x - 0.61*x'}\) and \(\boxed{'0.39*x'}\).