Укажите число, обратное сумме чисел \(\displaystyle k\) и \(\displaystyle l{\small.}\)

• \(\displaystyle -\frac{1}{k+l}\)
• \(\displaystyle -(k+l)\)
• \(\displaystyle \frac{1}{k+l}\)
• \(\displaystyle \frac{k}{l}\)