What is the product of all the simplest proper fractions whose denominator is 4?
分母是4的所有最简真分数的积是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/4) * (3/4)</gadget>
<output>3/16 = around 0.1875</output>

<result>3/16 = around 0.1875</result>