△/9=8...○, what is the maximum value of △?
△/9=8…○，△最大是多少．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

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

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

<result>80</result>