Suppose a※b=(a+b)+(ab), then 26※(13※5)=how much.
假设a※b=(a+b)+(a-b)，那么26※(13※5)=多少．
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">26 * 2</gadget>
<output>52</output>

<result>52</result>