(5/7)*(3/8)+(5/8)*(5/7).
(5/7)*(3/8)+(5/8)*(5/7)．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/7) * (3/8)</gadget>
<output>15/56 = around 0.267857</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) * (5/7)</gadget>
<output>25/56 = around 0.446429</output>

<gadget id="calculator">(15/56) + (25/56)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>