(1/2)+(2/(2*3))+(3/(2*3*4))+(4/(2*3*4*5))+…+(9/(2* 3*4...*10))= how much.
(1/2)+(2/(2*3))+(3/(2*3*4))+(4/(2*3*4*5))+…+(9/(2*3*4…*10))=多少．
<gadget id="calculator">1 / 3_628_800</gadget>
<output>1/3_628_800 = around 0</output>

<gadget id="calculator">1 - (1/3_628_800)</gadget>
<output>3_628_799/3_628_800 = around 1</output>

<result>3_628_799/3_628_800 = around 1</result>