((1/7)+(1/2))/(4/5).
((1/7)+(1/2))/(4/5)．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/7) + (1/2)</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(9/14) / (4/5)</gadget>
<output>45/56 = around 0.803571</output>

<result>45/56 = around 0.803571</result>