(4/5) plus how much is equal to the smallest prime number.
(4/5)加上多少等于最小的质数．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 - (4/5)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>