Use 3 meters long wire to form a square frame, the length of each side is the total length ((())/(())), how many meters is the actual length of each side.
用3米长的铁丝围成一个正方形框架，每边的长度是总长度的((())/(()))，每条边实际长多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4) / 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>