Calculation: (3/7)-((3/7)-(1/5))
计算：(3/7)-((3/7)-(1/5))
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/7) - (1/5)</gadget>
<output>8/35 = around 0.228571</output>

<gadget id="calculator">(3/7) - (8/35)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>