(4/5)*((5/6)+(5/9)).
(4/5)*((5/6)+(5/9))．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(5/6) + (5/9)</gadget>
<output>25/18 = around 1.388889</output>

<gadget id="calculator">(4/5) * (25/18)</gadget>
<output>10/9 = around 1.111111</output>

<result>10/9 = around 1.111111</result>