Calculation: 1*(2/29)+2*(3/29)+3*(4/29)+...27*(28/29)+28*(29/29)=how much.
计算：1*(2/29)+2*(3/29)+3*(4/29)+…27*(28/29)+28*(29/29)=多少．
<gadget id="calculator">1 + 28</gadget>
<output>29</output>

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">29 * 14</gadget>
<output>406</output>

<gadget id="calculator">28 + 1</gadget>
<output>29</output>

<gadget id="calculator">2 * 28</gadget>
<output>56</output>

<gadget id="calculator">56 + 1</gadget>
<output>57</output>

<gadget id="calculator">57 / 6</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">28 * 29 * (19/2)</gadget>
<output>7_714</output>

<gadget id="calculator">406 + 7_714</gadget>
<output>8_120</output>

<gadget id="calculator">1 / 29</gadget>
<output>1/29 = around 0.034483</output>

<gadget id="calculator">8_120 * (1/29)</gadget>
<output>280</output>

<result>280</result>