What is the product of (4/7) multiplied by its reciprocal.
(4/7)乘它的倒数的积是多少．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">7 / 4</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">(4/7) * (7/4)</gadget>
<output>1</output>

<result>1</result>