Obviously when calculating 3*((1/5)+□), the parentheses are lost, and the calculation result is smaller (1/3), then what should be □.
明明在计算3*((1/5)+□)时，把括号弄丢了，计算结果小了(1/3)，则□应该是多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>