One wire is (4/5) m long and (1/7) m shorter than the other wire, what is the length of the other wire in m.
一根铁丝长(4/5)m，比另一根短(1/7)m，另一根长多少m．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) + (1/7)</gadget>
<output>33/35 = around 0.942857</output>

<result>33/35 = around 0.942857</result>