Calculate (1/(1*3))+(1/(3*5))+(1/(5*7))+(1/(7*9))+…+(1/(49*51 )) value.
计算(1/(1*3))+(1/(3*5))+(1/(5*7))+(1/(7*9))+…+(1/(49*51))的值．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 51</gadget>
<output>1/51 = around 0.019608</output>

<gadget id="calculator">1 - (1/51)</gadget>
<output>50/51 = around 0.980392</output>

<gadget id="calculator">(1/2) * (50/51)</gadget>
<output>25/51 = around 0.490196</output>

<result>25/51 = around 0.490196</result>