Calculation: (2/3)+(1/6)-(5/9).
计算：(2/3)+(1/6)-(5/9)．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(1/6) - (5/9)</gadget>
<output>-7/18 = around -0.388889</output>

<gadget id="calculator">(2/3) + (-7/18)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>