(4/7)*(2/3)+(1/3)*(3/7).
(4/7)*(2/3)+(1/3)*(3/7)．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">(4/7) * (2/3)</gadget>
<output>8/21 = around 0.380952</output>

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

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/3) * (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(8/21) + (1/7)</gadget>
<output>11/21 = around 0.52381</output>

<result>11/21 = around 0.52381</result>