The rule expressed by the operation symbol "△" is a△b=a*b-((a)/(b)), so what is the value of (12△6)△7.
运算符号"△"表示的法则是a△b=a*b-((a)/(b))，那么(12△6)△7的值等于多少．
<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">72 - 2</gadget>
<output>70</output>

<gadget id="calculator">70 * 7</gadget>
<output>490</output>

<gadget id="calculator">70 / 7</gadget>
<output>10</output>

<gadget id="calculator">490 - 10</gadget>
<output>480</output>

<result>480</result>