What is the product of (2/3) minus (3/5) multiplied by (5/7)?
(2/3)减去(3/5)的差乘(5/7)，积是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/3) - (3/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(1/15) * (5/7)</gadget>
<output>1/21 = around 0.047619</output>

<result>1/21 = around 0.047619</result>