Use operation symbols and brackets to connect 1, 3, 7, 8 into a formula (use each number only once), try to give a formula that uses "/" and the result is equal to 24.
用运算符号及括号将1，3，7，8连接成一个算式(每个数只使用一次)，试给出一个使用了"/"且结果等于24的算式．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 - (7/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">3 / (1/8)</gadget>
<output>24</output>

<result>24</result>