Calculation: (2/(2*3))+(3/(2*3*4))+(4/(2*3*4*5))+…(9/(2*3*4…* 10)) = how much.
计算：(2/(2*3))+(3/(2*3*4))+(4/(2*3*4*5))+…(9/(2*3*4…*10))=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3_628_800</gadget>
<output>1/3_628_800 = around 0</output>

<gadget id="calculator">(1/2) - (1/3_628_800)</gadget>
<output>1_814_399/3_628_800 = around 0.5</output>

<result>1_814_399/3_628_800 = around 0.5</result>