a and b are two numbers (a, b≠0), b is more than a (1/4), and a is less than b ((())/(())).
a、b两个数(a、b≠0)，b比a多(1/4)，a比b少((())/(()))．
<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">(1/4) / (5/4)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>