Let a△b=a*a-2*b, find (5△2)△3.
设a△b=a*a-2*b，求(5△2)△3．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">25 - 4</gadget>
<output>21</output>

<gadget id="calculator">21 * 21</gadget>
<output>441</output>

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

<gadget id="calculator">441 - 6</gadget>
<output>435</output>

<result>435</result>