The numerator of a fraction is the product of two numbers that are reciprocals, and the denominator is the smallest prime number. What is (4/5) of this fraction.
一个分数的分子是互为倒数的两个数的积，分母是最小的质数．这个分数的(4/5)是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

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