Simple calculation: (2/3)/(4/9)*(2/5).
简算：(2/3)/(4/9)*(2/5)．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(2/3) / (4/9)</gadget>
<output>3/2 = around 1.5</output>

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

<gadget id="calculator">(3/2) * (2/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>