Calculation: (3/(2*5))+(3/(5*8))+(3/(8*11))+…+(3/(1991*1994))+(1/1994)= How many.
计算：(3/(2*5))+(3/(5*8))+(3/(8*11))+…+(3/(1991*1994))+(1/1994)=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>