The sum of the large and small numbers is 2009.9, and the decimal point of the larger number is moved two places to the left to equal the smaller number. What is the difference between the larger number and the smaller number?
大、小两个数的和是2009.9，较大数的小数点向左移动两位就等于较小的数，较大的数与较小的数之差是多少．
<gadget id="calculator">100 + 1</gadget>
<output>101</output>

<gadget id="calculator">2_009.9 / 101</gadget>
<output>19.9</output>

<gadget id="calculator">19.9 * 100</gadget>
<output>1_990</output>

<gadget id="calculator">1_990 - 19.9</gadget>
<output>1_970.1</output>

<result>1_970.1</result>