Find |1-(1/2)|+|(1/2)-(1/3)|+|(1/3)-(1/4)|+…+|(1/19)-(1 /20)|value.
求|1-(1/2)|+|(1/2)-(1/3)|+|(1/3)-(1/4)|+…+|(1/19)-(1/20)|的值．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>