Calculation: (4/21)*(8/11)+(4/11)*(10/21).
计算：(4/21)*(8/11)+(4/11)*(10/21)．
<gadget id="calculator">4 / 21</gadget>
<output>4/21 = around 0.190476</output>

<gadget id="calculator">8 / 11</gadget>
<output>8/11 = around 0.727273</output>

<gadget id="calculator">(4/21) * (8/11)</gadget>
<output>32/231 = around 0.138528</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">10 / 21</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">(4/11) * (10/21)</gadget>
<output>40/231 = around 0.17316</output>

<gadget id="calculator">(32/231) + (40/231)</gadget>
<output>24/77 = around 0.311688</output>

<result>24/77 = around 0.311688</result>