((1/2)+(1/3)+(1/4)+…+(1/19)+(1/20))+((2/3)+(2/4)+(2/ 5)+…+(2/20))+((3/4)+(3/5)+(3/6)+…+(3/20))+((4/5)+(4/ 6)+(4/7)+...+(4/20))+...+((18/19)+(18/20))+(19/20)=how much.
((1/2)+(1/3)+(1/4)+…+(1/19)+(1/20))+((2/3)+(2/4)+(2/5)+…+(2/20))+((3/4)+(3/5)+(3/6)+…+(3/20))+((4/5)+(4/6)+(4/7)+…+(4/20))+…+((18/19)+(18/20))+(19/20)=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">9 + (1/2)</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">0.5 + (19/2)</gadget>
<output>10</output>

<gadget id="calculator">(19/2) / 0.5</gadget>
<output>19</output>

<gadget id="calculator">19 / 2</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">10 * (19/2)</gadget>
<output>95</output>

<result>95</result>