Calculation: 1+(7/9)+(3/7).
计算：1+(7/9)+(3/7)．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

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

<gadget id="calculator">1 + (7/9) + (3/7)</gadget>
<output>139/63 = around 2.206349</output>

<result>139/63 = around 2.206349</result>