Additional question: When a number is added, subtracted, or divided by itself, the sum, difference, and quotient add up to 8.6. What is this number?
附加题：一个数与它自己相加、减、除，其和、差、商相加为8.6，这个数是多少．
<gadget id="calculator">8.6 - 0 - 1</gadget>
<output>7.6</output>

<gadget id="calculator">7.6 / 2</gadget>
<output>3.8</output>

<result>3.8</result>