Calculation: (1/2)*(1/77)+(1/3)*(1/77)+(1/4)*(1/77)+(1/5)*(1/77).
计算：(1/2)*(1/77)+(1/3)*(1/77)+(1/4)*(1/77)+(1/5)*(1/77)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 77</gadget>
<output>1/77 = around 0.012987</output>

<gadget id="calculator">(1/2) * (1/77)</gadget>
<output>1/154 = around 0.006494</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * (1/77)</gadget>
<output>1/231 = around 0.004329</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * (1/77)</gadget>
<output>1/308 = around 0.003247</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/77)</gadget>
<output>1/385 = around 0.002597</output>

<gadget id="calculator">(1/154) + (1/231) + (1/308) + (1/385)</gadget>
<output>1/60 = around 0.016667</output>

<result>1/60 = around 0.016667</result>