Divide (4/7) of a piece of paper into 3 parts on average, and each part is the amount of this paper.
把一张纸的(4/7)平均分成3份，每份是这张纸的多少．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) / 3</gadget>
<output>4/21 = around 0.190476</output>

<gadget id="calculator">1 * (4/21)</gadget>
<output>4/21 = around 0.190476</output>

<result>4/21 = around 0.190476</result>