Divide a square piece of paper into 5 parts on average, cut off one part, then divide the remaining part into 4 parts, and cut off one part. At this time, the remaining area occupies the area of the original square ((( ))/(())).
把一张正方形纸片平均分成5份，剪去其中的1份，再把剩下的平均分成4份，又剪去其中的1份，这时，剩下的面积占原来正方形的((())/(()))．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) * (3/4)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>