Calculate (1/(1*3*5))+(1/(3*5*7))+(1/(5*7*9))+…+(1/(2001*2003*2005)) ．
计算(1/(1*3*5))+(1/(3*5*7))+(1/(5*7*9))+…+(1/(2001*2003*2005))．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2_003 * 2_005</gadget>
<output>4_016_015</output>

<gadget id="calculator">1 / 4_016_015</gadget>
<output>1/4_016_015 = around 0</output>

<gadget id="calculator">(1/3) - (1/4_016_015)</gadget>
<output>4_016_012/12_048_045 = around 0.333333</output>

<gadget id="calculator">(1/4) * (4_016_012/12_048_045)</gadget>
<output>1_004_003/12_048_045 = around 0.083333</output>

<result>1_004_003/12_048_045 = around 0.083333</result>