The current price of the car is (1/7) lower than the original price, and the current price is the original price ((())/(())).
汽车的现价比原价降低了(1/7)，现价是原价的((())/(()))．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(6/7) / 1</gadget>
<output>6/7 = around 0.857143</output>

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