(4/7)*((3/10)+((8/9)-(1/3))).
(4/7)*((3/10)+((8/9)-(1/3)))．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(8/9) - (1/3)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(3/10) + (5/9)</gadget>
<output>77/90 = around 0.855556</output>

<gadget id="calculator">(4/7) * (77/90)</gadget>
<output>22/45 = around 0.488889</output>

<result>22/45 = around 0.488889</result>