((4/5)-(2/3))*(15/4).
((4/5)-(2/3))*(15/4)．
<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">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">15 / 4</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(2/15) * (15/4)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>