Calculation: (1/2)+((1/3)+(2/3))+((3/4)+(2/4)+(1/4))+((4/5)+( 3/5)+(2/5)+(1/5))+...+((19/20)+(18/20)+...+(1/20))=how much.
计算：(1/2)+((1/3)+(2/3))+((3/4)+(2/4)+(1/4))+((4/5)+(3/5)+(2/5)+(1/5))+…+((19/20)+(18/20)+…+(1/20))=多少．
<gadget id="calculator">1 + 19</gadget>
<output>20</output>

<gadget id="calculator">19 / 2 / 2</gadget>
<output>19/4 = around 4.75</output>

<gadget id="calculator">20 * (19/4)</gadget>
<output>95</output>

<result>95</result>