Definition: a△b=ab-3b. a⊙b=4a-b/a. Calculation: (4△3)△(2⊙6).
定义：a△b=ab-3b．a⊙b=4a-b/a．计算：(4△3)△(2⊙6)．
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

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

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 - 15</gadget>
<output>0</output>

<result>0</result>