What is (1/3) the difference between the largest four-digit number and the largest three-digit number.
最大的四位数与最大的三位数的差的(1/3)是多少．
<gadget id="calculator">9_999 - 999</gadget>
<output>9_000</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9_000 * (1/3)</gadget>
<output>3_000</output>

<result>3_000</result>