The speed of the car is slower than the speed of the car (2/5), the number should be regarded as the unit "1", the speed of the car is the speed of the car ((())/(())).
汽车速度比轿车的速度慢(2/5)，应把多少看做单位"1"，汽车的速度是轿车速度的((())/(()))．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>