The numerator of a fraction is the product of two numbers that are reciprocals of each other. This is 3 smaller than the denominator. What is (1/5) of this fraction?
一个分数的分子是互为倒数的两个数的乘积，此比分母小3，这个分数的(1/5)是多少．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) * (1/5)</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>