When Wang Jing calculated 34.6+8.5, he wrote 34.6-8.5 by mistake. Compared with the correct result, what is the difference?
王晶在计算34.6+8.5时，错写成了34.6-8.5，这样得到的结果和正确结果相比，有什么变化？
<gadget id="calculator">8.5 * 2</gadget>
<output>17</output>

<result>17</result>