1-(2/(1*(1+2)))-(3/((1+2)*(1+2+3)))-(4/((1+2+3)*(1 +2+3+4)))-…-(10/((1+2+…+9)*(1+2+…+10)))=how much.
1-(2/(1*(1+2)))-(3/((1+2)*(1+2+3)))-(4/((1+2+3)*(1+2+3+4)))-…-(10/((1+2+…+9)*(1+2+…+10)))=多少．
<gadget id="calculator">1 / 55</gadget>
<output>1/55 = around 0.018182</output>

<result>1/55 = around 0.018182</result>