x:(1/4)=1:(1/2).
x：(1/4)=1：(1/2)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/4) / (1/2)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>