(3/(2*5))+(3/(5*8))+(3/(8*11))+…+(3/(1997*2000))+(3/(2000*2003) ) = how much.
(3/(2*5))+(3/(5*8))+(3/(8*11))+…+(3/(1997*2000))+(3/(2000*2003))=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 2_003</gadget>
<output>1/2_003 = around 0.000499</output>

<gadget id="calculator">(1/2) - (1/2_003)</gadget>
<output>2_001/4_006 = around 0.499501</output>

<result>2_001/4_006 = around 0.499501</result>