Calculation: (2/15)+(2/35)+(2/63)+(2/99).
计算：(2/15)+(2/35)+(2/63)+(2/99)．
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">2 / 35</gadget>
<output>2/35 = around 0.057143</output>

<gadget id="calculator">2 / 63</gadget>
<output>2/63 = around 0.031746</output>

<gadget id="calculator">2 / 99</gadget>
<output>2/99 = around 0.020202</output>

<gadget id="calculator">(2/15) + (2/35) + (2/63) + (2/99)</gadget>
<output>8/33 = around 0.242424</output>

<result>8/33 = around 0.242424</result>