Fill in the appropriate numbers on the lines. How much/9=520…□(Maximize the dividend)
在横线填上合适的数字．多少/9=520…□(使被除数最大)
<gadget id="calculator">520 * 9</gadget>
<output>4_680</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">4_680 + 8</gadget>
<output>4_688</output>

<result>4_688</result>