According to 1-(1/2)=(1/(1*2)), (1/2)-(1/3)=(1/(2*3))..., then (1/(1*2 ))+(1/(2*3))+(1/(3*4))+(1/(4*5))+(1/(5*6))+(1/(6*7) ))...(1/(18*19))=
根据1-(1/2)=(1/(1*2))，(1/2)-(1/3)=(1/(2*3))…，那么(1/(1*2))+(1/(2*3))+(1/(3*4))+(1/(4*5))+(1/(5*6))+(1/(6*7))…(1/(18*19))=
<gadget id="calculator">1 / 19</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">1 - (1/19)</gadget>
<output>18/19 = around 0.947368</output>

<result>18/19 = around 0.947368</result>