Calculation: (1-0.75)/(1+(1/4))
计算：(1-0.75)/(1+(1/4))
<gadget id="calculator">1 - 0.75</gadget>
<output>0.25</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">0.25 / (5/4)</gadget>
<output>0.2</output>

<result>0.2</result>