((7/9)+(2/3)*(5/6))/(4/15).
((7/9)+(2/3)*(5/6))/(4/15)．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) * (5/6)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(7/9) + (5/9)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(4/3) / (4/15)</gadget>
<output>5</output>

<result>5</result>