3 (1/5) is ((())/(())), how many (1/7) is (5/7), 11 ((())/(())) is (11 /13).
3个(1/5)是((())/(()))，多少个(1/7)是(5/7)，11个((())/(()))是(11/13)．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(5/7) / (1/7)</gadget>
<output>5</output>

<result>5</result>