If the decimal point of a decimal is moved one bit to the right and left respectively, the difference between the two numbers is 2.2, then the decimal is expressed as a fraction.
一个小数的小数点分别向右，左边移动一位所得两数之差为2.2，则这个小数用分数表示为多少．
<gadget id="calculator">10 - 0.1</gadget>
<output>9.9</output>

<gadget id="calculator">2.2 / 9.9</gadget>
<output>0.222222</output>

<result>0.222222</result>