Calculation: (1/(1*2*3))+(1/(2*3*4))+(1/(3*4*5)).
计算：(1/(1*2*3))+(1/(2*3*4))+(1/(3*4*5))．
<gadget id="calculator">1 * 2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 * 3 * 4</gadget>
<output>24</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">3 * 4 * 5</gadget>
<output>60</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/6) + (1/24) + (1/60)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>