If the decimal point of a decimal is moved one place to the right, the resulting number is 8.1 greater than the original number, then what should be the number.
一个小数的小数点向右移动一位，所得数比原来的数大8.1，那么这个数应是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">8.1 / 9</gadget>
<output>0.9</output>

<result>0.9</result>