If (1/(x))=(2/7), then x=how much.
如果(1/(x))=(2/7)，那么x=多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / (2/7)</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>