Obviously dividing a number by (2/7) is miscalculated as multiplying by (2/7), and the result is 1. What is the correct result of this formula?
明明把一个数除以(2/7)错算成乘以(2/7)，得到的结果是1，这个算式正确的计算结果是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / (2/7) / (2/7)</gadget>
<output>49/4 = around 12.25</output>

<result>49/4 = around 12.25</result>