(3/5) plus how much is equal to a natural number that is neither prime nor composite.
(3/5)加上多少等于既不是质数也不是合数的自然数．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>