For a decimal, the sum of its decimal point moved one place to the left and the original number is 5.72, what is the decimal.
一个小数，将它的小数点向左移动一位后与原数的和是5.72，该小数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">5.72 / 11</gadget>
<output>0.52</output>

<gadget id="calculator">0.52 * 10</gadget>
<output>5.2</output>

<result>5.2</result>