Using "ten thousand" as the unit, what is the maximum difference between the exact number of 500,000 and the approximate number of 500,000.
用"万"作单位，准确数50万与近似数50万比较最多相差多少．
<gadget id="calculator">50 * 10_000</gadget>
<output>500_000</output>

<gadget id="calculator">500_000 - 495_000</gadget>
<output>5_000</output>

<result>5_000</result>