In the formula ☆/9=8...□, what is the largest ☆?
在算式☆/9=8…□中，☆最大是多少．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<gadget id="calculator">72 + 8</gadget>
<output>80</output>

<result>80</result>