Divide (4/5) of a piece of paper into 4 parts on average, and each part is the amount of this paper.
把一张纸的(4/5)平均分成4份，每份是这张纸的多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 4</gadget>
<output>1/5 = around 0.2</output>

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

<result>1/5 = around 0.2</result>