Calculation: (29/(1*2))+(29/(2*3))+...+(29/(28*29))=how much.
计算：(29/(1*2))+(29/(2*3))+…+(29/(28*29))=多少．
<gadget id="calculator">1 / 29</gadget>
<output>1/29 = around 0.034483</output>

<gadget id="calculator">1 - (1/29)</gadget>
<output>28/29 = around 0.965517</output>

<gadget id="calculator">29 * (28/29)</gadget>
<output>28</output>

<result>28</result>