Calculation: (5/6)*(2/7)+(1/3)/(2/5)*(5/7).
计算：(5/6)*(2/7)+(1/3)/(2/5)*(5/7)．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(5/6) * (2/7)</gadget>
<output>5/21 = around 0.238095</output>

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

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/3) / (2/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/6) * (5/7)</gadget>
<output>25/42 = around 0.595238</output>

<gadget id="calculator">(5/21) + (25/42)</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>