If a number is added, subtracted, or divided by itself, the resulting sum, difference, and quotient add up to 5.8. What is this number?
一个数与它自己相加、相减、相除，所得的和、差、商相加为5.8，这个数是多少．
<gadget id="calculator">5.8 - 0 - 1</gadget>
<output>4.8</output>

<gadget id="calculator">4.8 / 2</gadget>
<output>2.4</output>

<result>2.4</result>