(3/7)*((4/5)-(2/3))/(3/10).
(3/7)*((4/5)-(2/3))/(3/10)．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

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

<gadget id="calculator">(2/15) / (3/10)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(3/7) * (4/9)</gadget>
<output>4/21 = around 0.190476</output>

<result>4/21 = around 0.190476</result>