What is the sum of (4/7) and (2/7)?
(4/7)和(2/7)的和是多少？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(4/7) + (2/7)</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>