What is (3/10) the difference between the largest three-digit number and the smallest four-digit number?
最大的三位数与最小的四位数的差的(3/10)为多少．
<gadget id="calculator">1_000 - 999</gadget>
<output>1</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 * (3/10)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>