(1/2), (1/3), (1/5), how much, (1/13), (1/21).
(1/2)、(1/3)、(1/5)、多少、(1/13)、(1/21)．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>