There is a 1-meter-long wooden strip, (1/3) of it is occupied for the first time, the remaining (1/4) is occupied for the second time, and the remaining (1/5) is occupied for the third time,..., Go on like this, take away the remaining (1/8) for the last time, how many meters is left on this wooden strip
有一根1米长的木条，第一次据掉它的(1/3)，第二次据掉余下的(1/4)，第三次据掉余下的(1/5)，…，这样下去，最后一次据掉余下的(1/8)，这根木条最后剩多少米
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 * (2/3) * (3/4) * (4/5) * (5/6) * (6/7) * (7/8)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>