There is a 1-meter-long wooden strip, remove it (1/5) for the first time; remove (1/6) of the remaining wooden strip for the second time; remove (1/7) of the remaining wooden strip for the third time ), and so on; go on like this, and remove (1/10) of the last wooden stick for the last time, and ask: How long is this wooden stick left in the end?
有一根1米长的木条，第一次去掉它的(1/5)；第二次去掉余下木条的(1/6)；第三次去掉第二次余下木条的(1/7)，等等；这样一直下去，最后一次去掉上次余下木条的(1/10)，问：这根木条最后还剩下多长？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(4/5) * (5/6) * (6/7) * (7/8) * (8/9) * (9/10)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 * (2/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>