A piece of round steel is 8 meters long, cut off (1/2) and then cut off (1/2) meter, what is the remaining part of the original.
一根圆钢长8米，锯下(1/2)，又锯下(1/2)米，剩下的占原来的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<gadget id="calculator">8 - 4 - (1/2)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) / 8</gadget>
<output>7/16 = around 0.4375</output>

<result>7/16 = around 0.4375</result>