If a□=a*(a+1), d□□=d□*(d□+1), •• then 1□□=how much.
如果a□=a*(a+1)，d□□=d□*(d□+1)，••那么1□□=多少．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>