a and b (a>b) are two different three-digit decimals, and the rounded approximate value is 2.38, so what is the maximum difference between a and b?
a和b(a＞b)是两个不同的三位小数，四舍五入取近似值都是2.38，则a和b最大相差多少．
<gadget id="calculator">2.384 - 2.375</gadget>
<output>0.009</output>

<result>0.009</result>