If the decimal point of a decimal is moved one place to the right, the number obtained is 7.2 larger than the original number, so what is the original decimal number?
一个小数小数点向右移动一位后得到的数比原来的数增大了7.2，那么原来的小数是多少．
<gadget id="calculator">7.2 / 9</gadget>
<output>0.8</output>

<result>0.8</result>