What is the result of subtracting (2/5) from (3/4) minus (2/5).
(3/4)减去(2/5)的差去除(2/5)，结果是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(2/5) / (7/20)</gadget>
<output>8/7 = around 1.142857</output>

<result>8/7 = around 1.142857</result>