What is the difference between the reciprocal of (7/8) and (4/5).
(7/8)的倒数与(4/5)的差是多少．
<gadget id="calculator">8 / 7</gadget>
<output>8/7 = around 1.142857</output>

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

<gadget id="calculator">(8/7) - (4/5)</gadget>
<output>12/35 = around 0.342857</output>

<result>12/35 = around 0.342857</result>