Calculation: (4/5)*(2/3)/(4/5)*(2/3).
计算：(4/5)*(2/3)/(4/5)*(2/3)．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) / (4/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(4/5) * (5/6) * (2/3)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>