Simple operation: (4/5)*(8/3)-0.8*(5/3).
简便运算：(4/5)*(8/3)-0.8*(5/3)．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">8 / 3</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">(4/5) * (8/3)</gadget>
<output>32/15 = around 2.133333</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">0.8 * (5/3)</gadget>
<output>1.333333</output>

<gadget id="calculator">(32/15) - 1.333333</gadget>
<output>0.8</output>

<result>0.8</result>