After moving the decimal point of a number one place to the left, what is the original number that is 1.8 less than the original number?
把一个数的小数点向左移动一位后，比原数少1.8原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1.8 / 9</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 * 10</gadget>
<output>2</output>

<result>2</result>