Calculation: 1-(1/(1+(1/(1-(1/1987))))) = how much.
计算：1-(1/(1+(1/(1-(1/1987)))))=多少．
<gadget id="calculator">1 * 1_987</gadget>
<output>1_987</output>

<gadget id="calculator">1 / 1_987</gadget>
<output>1/1_987 = around 0.000503</output>

<gadget id="calculator">1 - (1/1_987)</gadget>
<output>1_986/1_987 = around 0.999497</output>

<gadget id="calculator">(1_986/1_987) * 1_987</gadget>
<output>1_986</output>

<gadget id="calculator">1_987 / 1_986</gadget>
<output>1_987/1_986 = around 1.000504</output>

<gadget id="calculator">1 + (1_987/1_986)</gadget>
<output>3_973/1_986 = around 2.000504</output>

<gadget id="calculator">1 / (3_973/1_986)</gadget>
<output>1_986/3_973 = around 0.499874</output>

<gadget id="calculator">1 - (1_986/3_973)</gadget>
<output>1_987/3_973 = around 0.500126</output>

<result>1_987/3_973 = around 0.500126</result>