Both a and b have two decimal places, and both get 3.0 after rounding. What is the maximum difference between a and b?
a和b都是两位小数，四舍五入后都得3.0，a和b最大相差多少．
<gadget id="calculator">3.04 - 2.95</gadget>
<output>0.09</output>

<result>0.09</result>