A small stick is sawed to be equal, and sawed 4 times in total, each segment is the size of the small stick.
把一根小棒锯成相等的，共锯了4次，每段是这根小棒的多少．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

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