When Xiaojie calculated 6.85 with a vertical formula and added a two-digit decimal, he regarded the plus sign as a minus sign and got 2.39. The correct result of this question is ____.
小杰用竖式计算6.85加上一个两位小数时，把加号看成了减号得2.39，这题正确的结果是____．
<gadget id="calculator">6.85 - 2.39</gadget>
<output>4.46</output>

<gadget id="calculator">6.85 + 4.46</gadget>
<output>11.31</output>

<result>11.31</result>